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35 results on '"Hertlein, M. P."'

1. Ultrafast evolution and transient phases of the prototype out-of-equilibrium Mott-Hubbard material V2O3

Author

Lantz, G., Mansart, B, Grieger, D., Boschetto, D., Nilforoushan, N., Papalazarou, E., Moisan, N., Perfetti, L., Jacques, V. L. R., Bolloc'h, D. Le, Laulhé, C., Ravy, S., Rueff, J. -P., Glover, T. E., Hertlein, M. P., Hussain, Z., Song, S., Chollet, M., Fabrizio, M., and Marsi, M.

Subjects
Condensed Matter - Strongly Correlated Electrons
Abstract

The study of photoexcited strongly correlated materials is attracting growing interest since their rich phase diagram often translates into an equally rich out-of-equilibrium behavior, including non-thermal phases and photoinduced phase transitions. With femtosecond optical pulses, electronic and lattice degrees of freedom can be transiently decoupled, giving the opportunity of stabilizing new states of matter inaccessible by quasi-adiabatic pathways. Here we present a study of the ultrafast non-equilibrium evolution of the prototype Mott-Hubbard material V2O3, which presents a transient non-thermal phase developing immediately after photoexcitation and lasting few picoseconds. For both the insulating and the metallic phase, the formation of the transient configuration is triggered by the excitation of electrons into the bonding a1g orbital, and is then stabilized by a lattice distortion characterized by a marked hardening of the A1g coherent phonon. This configuration is in stark contrast with the thermally accessible ones - the A1g phonon frequency actually softens when heating the material. Our results show the importance of selective electron-lattice interplay for the ultrafast control of material parameters, and are of particular relevance for the optical manipulation of strongly correlated systems, whose electronic and structural properties are often strongly intertwinned., Comment: 6 pages, 4 figures

Published
2016
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2. Transient Exchange Interaction in a Helical Antiferromagnet

Author

Langner, M. C., Roy, S., Kemper, A. F., Chuang, Y. -D., Mishra, S. K., Versteeg, R. B., Zhu, Y., Hertlein, M. P., Glover, T. E., Dumesnil, K., and Schoenlein, R. W.

Subjects
Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Materials Science
Abstract

We have performed time-resolved resonant x-ray scattering studies in the Lanthanide metal Dy to reveal the dynamic response of the helical order exchange coupling to injection of unpolarized spins. The observed spin dynamics are significantly slower than that exhibited by the ferromagnetic phase in Lanthanide metals and are strongly dependent on temperature and excitation fluence. This unique behavior results from transient changes in the shape of the conduction electron Fermi surface and subsequent scattering events that transfer the excitation to the core spin.

Published
2014
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3. Glass-like recovery of antiferromagnetic spin ordering and dimensional crossover in a photo-excited manganite Pr$_{0.7}$Ca$_{0.3}$MnO$_3$

Author

Zhou, S. Y., Langner, M. C., Zhu, Y., Chuang, Y. -D., Rini, M., Glover, T. E., Hertlein, M. P., Gonzalez, A. G. Cruz, Tahir, N., Tomioka, Y., Tokura, Y., Hussain, Z., and Schoenlein, R. W.

Subjects
Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Materials Science
Abstract

Electronic orderings of charges, orbitals and spins are observed in many strongly correlated electron materials, and revealing their dynamics is a critical step toward understanding the underlying physics of important emergent phenomena. Here we use time-resolved resonant soft x-ray scattering spectroscopy to probe the dynamics of antiferromagnetic spin ordering in the manganite Pr$_{0.7}$Ca$_{0.3}$MnO$_3$ following ultrafast photo-exitation. Our studies reveal a glass-like recovery of the spin ordering and a crossover in the dimensionality of the restoring interaction from quasi-1D at low pump fluence to 3D at high pump fluence. This behavior arises from the metastable state created by photo-excitation, a state characterized by spin disordered metallic droplets within the larger charge- and spin-ordered insulating domains. Comparison with time-resolved resistivity measurements suggests that the collapse of spin ordering is correlated with the insulator-to-metal transition, but the recovery of the insulating phase does not depend on the re-establishment of the spin ordering., Comment: Scientific Reports, in press

Published
2012

4. Probing impulsive strain propagation with x-ray pulses

Author

Reis, D. A., DeCamp, M. F., Bucksbaum, P. H., Clarke, R., Dufresne, E., Hertlein, M., Merlin, R., Falcone, R., Kapteyn, H., Murnane, M., Larsson, J., Missalla, Th., and Wark, J.

Subjects
Condensed Matter
Abstract

Pump-probe time-resolved x-ray diffraction of allowed and nearly forbidden reflections in InSb is used to follow the propagation of a coherent acoustic pulse generated by ultrafast laser-excitation. The surface and bulk components of the strain could be simultaneously measured due to the large x-ray penetration depth. Comparison of the experimental data with dynamical diffraction simulations suggests that the conventional model for impulsively generated strain underestimates the partitioning of energy into coherent modes., Comment: 4 pages, 2 figures, LaTeX, eps. Accepted for publication in Phys. Rev. Lett. http://prl.aps.org

Published
2001
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6. Ultrafast Bond Softening in Bismuth: Mapping a Solid's Interatomic Potential with X-Rays

Author

Fritz, D. M., Reis, D. A., Adams, B., Akre, R. A., Arthur, J., Blome, C., Bucksbaum, P. H., Cavalieri, A. L., Engemann, S., Fahy, S., Falcone, R. W., Fuoss, P. H., Gaffney, K. J., George, M. J., Hajdu, J., Hertlein, M. P., Hillyard, P. B., Hoegen, M. Horn-von, Kammler, M., Kaspar, J., Kienberger, R., Krejcik, P., Lee, S. H., Lindenberg, A. M., McFarland, B., Meyer, D., Montagne, T., Murray, É. D., Nelson, A. J., Nicoul, M., Pahl, R., Rudati, J., Schlarb, H., Siddons, D. P., Sokolowski-Tinten, K., Tschentscher, Th., von der Linde, D., and Hastings, J. B.

Published
2007
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7. Ultrafast evolution and transient phases of a prototype out-of-equilibrium Mott-Hubbard material

Author

Lantz, G., Mansart, B., Grieger, D., Boschetto, D., Nilforoushan, N., Papalazarou, E., Moisan, N., Perfetti, L., Jacques, V. L. R., Le Bolloc'h, D., Laulhé, C., Ravy, S., Rueff, J-P, Glover, T. E., Hertlein, M. P., Hussain, Z., Song, S., Chollet, M., Fabrizio, M., Marsi, M., Laboratoire de Physique des Solides (LPS), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Institute for Quantum Electronics, Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), Scuola Internazionale Superiore di Studi Avanzati / International School for Advanced Studies (SISSA / ISAS), Laboratoire d'optique appliquée (LOA), École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Laboratoire des Solides Irradiés (LSI), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Laboratoire de Chimie Physique - Matière et Rayonnement (LCPMR), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Advanced Light Source [LBNL Berkeley] (ALS), Lawrence Berkeley National Laboratory [Berkeley] (LBNL), Linac Coherent Light Source (LCLS), SLAC National Accelerator Laboratory (SLAC), Stanford University-Stanford University, ANR-11-IDEX-0003,IPS,Idex Paris-Saclay(2011), ANR-11-EQPX-0005,ATTOLAB,Plateforme pour la dynamique attoseconde(2011), European Project: 280555,EC:FP7:NMP,FP7-NMP-2011-SMALL-5,GO FAST(2012), European Project: 692670,H2020,ERC-2015-AdG,FIRSTORM(2016), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)

Subjects
Materials science, Phonon, Science, General Physics and Astronomy, 02 engineering and technology, 01 natural sciences, Article, General Biochemistry, Genetics and Molecular Biology, VIBRATIONS, Settore FIS/03 - Fisica della Materia, Condensed Matter::Materials Science, VO2, CR-DOPED V2O3, 0103 physical sciences, Physics::Chemical Physics, 010306 general physics, Phase diagram, [PHYS]Physics [physics], Multidisciplinary, Condensed matter physics, General Chemistry, 021001 nanoscience & nanotechnology, STATE, TRANSITION, TIME, SPIN, Photoexcitation, Picosecond, Femtosecond, Strongly correlated material, Condensed Matter::Strongly Correlated Electrons, Atomic physics, 0210 nano-technology, Ultrashort pulse, Excitation
Abstract

The study of photoexcited strongly correlated materials is attracting growing interest since their rich phase diagram often translates into an equally rich out-of-equilibrium behaviour. With femtosecond optical pulses, electronic and lattice degrees of freedom can be transiently decoupled, giving the opportunity of stabilizing new states inaccessible by quasi-adiabatic pathways. Here we show that the prototype Mott–Hubbard material V2O3 presents a transient non-thermal phase developing immediately after ultrafast photoexcitation and lasting few picoseconds. For both the insulating and the metallic phase, the formation of the transient configuration is triggered by the excitation of electrons into the bonding a1g orbital, and is then stabilized by a lattice distortion characterized by a hardening of the A1g coherent phonon, in stark contrast with the softening observed upon heating. Our results show the importance of selective electron–lattice interplay for the ultrafast control of material parameters, and are relevant for the optical manipulation of strongly correlated systems., Nature Communications, 8, ISSN:2041-1723

Published
2017
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11. Transient Exchange Interaction in a Helical Antiferromagnet

Author

Langner, Matt, primary, Roy, Sujoy, additional, Kemper, A. F., additional, Chuang, Y.-D., additional, Mishra, S., additional, Versteeg, R. B., additional, Zhu, Yi, additional, Hertlein, M. P., additional, Glover, T. E., additional, Dumesnil, K., additional, and Schoenlein, R. W., additional

Published
2015
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13. Molecular frame Auger electron energy spectrum from N2

Author

Cryan, J P, Glownia, J M, Andreasson, Jakob, Belkacem, A, Berrah, N, Blaga, C I, Bostedt, C, Bozek, J, Cherepkov, N A, DiMauro, L F, Fang, L, Gessner, O, Guhr, M, Hajdu, Janos, Hertlein, M P, Hoener, M, Kornilov, O, Marangos, J P, March, A M, McFarland, B K, Merdji, H, Messerschmidt, M, Petrović, V S, Raman, C, Ray, D, Reis, D A, Semenov, S K, Trigo, M, White, J L, White, W, Young, L, Bucksbaum, P H, Coffee, R N, Cryan, J P, Glownia, J M, Andreasson, Jakob, Belkacem, A, Berrah, N, Blaga, C I, Bostedt, C, Bozek, J, Cherepkov, N A, DiMauro, L F, Fang, L, Gessner, O, Guhr, M, Hajdu, Janos, Hertlein, M P, Hoener, M, Kornilov, O, Marangos, J P, March, A M, McFarland, B K, Merdji, H, Messerschmidt, M, Petrović, V S, Raman, C, Ray, D, Reis, D A, Semenov, S K, Trigo, M, White, J L, White, W, Young, L, Bucksbaum, P H, and Coffee, R N

Abstract

Here we present the first angle-resolved, non-resonant (normal) Auger spectra for impulsively aligned nitrogen molecules. We have measured the angular pattern of Auger electron emission following K -shell photoionization by 1.1 keV photons from the Linac Coherent Light Source (LCLS). Using strong-field-induced molecular alignment to make molecular frame measurements is equally effective for both repulsive and quasi-bound final states. The capability to resolve Auger emission angular distributions in the molecular frame of reference provides a new tool for spectral assignments in congested Auger electron spectra that takes advantage of the symmetries of the final diction states. Based on our experimental results and theoretical predictions, we propose the assignment of the spectral features in the Auger electron spectrum.

Published
2012
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14. Auger Electron Angular Distribution of Double Core-Hole States in the Molecular Reference Frame

Author

Cryan, James P., Glownia, J. M., Andreasson, Jakob, Belkacem, A., Berrah, N., Blaga, C. I., Bostedt, C., Bozek, J., Buth, C., DiMauro, L. F., Fang, L., Gessner, O., Guehr, M., Hajdu, Janos, Hertlein, M. P., Hoener, M., Kornilov, O., Marangos, J. P., March, A. M., McFarland, B. K., Merdji, H., Petrovic, V. S., Raman, C., Ray, D., Reis, D., Tarantelli, F., Trigo, M., White, J. L., White, W., Young, L., Bucksbaum, P. H., Coffee, R. N., Cryan, James P., Glownia, J. M., Andreasson, Jakob, Belkacem, A., Berrah, N., Blaga, C. I., Bostedt, C., Bozek, J., Buth, C., DiMauro, L. F., Fang, L., Gessner, O., Guehr, M., Hajdu, Janos, Hertlein, M. P., Hoener, M., Kornilov, O., Marangos, J. P., March, A. M., McFarland, B. K., Merdji, H., Petrovic, V. S., Raman, C., Ray, D., Reis, D., Tarantelli, F., Trigo, M., White, J. L., White, W., Young, L., Bucksbaum, P. H., and Coffee, R. N.

Abstract

The Linac Coherent Light Source free electron laser is a source of high brightness x rays, 2×1011 photons in a ∼5 fs pulse, that can be focused to produce double core vacancies through rapid sequential ionization. This enables double core vacancy Auger electron spectroscopy, an entirely new way to study femtosecond chemical dynamics with Auger electrons that probe the local valence structure of molecules near a specific atomic core. Using 1.1 keV photons for sequential x-ray ionization of impulsively aligned molecular nitrogen, we observed a rich single-site double core vacancy Auger electron spectrum near 413 eV, in good agreement with ab initio calculations, and we measured the corresponding Auger electron angle dependence in the molecular frame.

Published
2010
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15. Time-resolved pump-probe experiments at the LCLS

Author

Glownia, James M., Cryan, J., Andreasson, Jakob, Belkacem, A., Berrah, N., Blaga, C. I., Bostedt, C., Bozek, J., DiMauro, L. F., Fang, L., Frisch, J., Gessner, O., Guehr, M., Hajdu, Janos, Hertlein, M. P., Hoener, M., Huang, G., Kornilov, O., Marangos, J. P., March, A. M., McFarland, B. K., Merdji, H., Petrovic, V. S., Raman, C., Ray, D., Reis, D. A., Trigo, M., White, J. L., White, W., Wilcox, R., Young, L., Coffee, R. N., Bucksbaum, P. H., Glownia, James M., Cryan, J., Andreasson, Jakob, Belkacem, A., Berrah, N., Blaga, C. I., Bostedt, C., Bozek, J., DiMauro, L. F., Fang, L., Frisch, J., Gessner, O., Guehr, M., Hajdu, Janos, Hertlein, M. P., Hoener, M., Huang, G., Kornilov, O., Marangos, J. P., March, A. M., McFarland, B. K., Merdji, H., Petrovic, V. S., Raman, C., Ray, D., Reis, D. A., Trigo, M., White, J. L., White, W., Wilcox, R., Young, L., Coffee, R. N., and Bucksbaum, P. H.

Abstract

The first time-resolved x-ray/optical pump-probe experiments at the SLAC Linac Coherent Light Source (LCLS) used a combination of feedback methods and post-analysis binning techniques to synchronize an ultrafast optical laser to the linac-based x-ray laser. Transient molecular nitrogen alignment revival features were resolved in time-dependent x-ray-induced fragmentation spectra. These alignment features were used to find the temporal overlap of the pump and probe pulses. The strong-field dissociation of x-ray generated quasi-bound molecular dications was used to establish the residual timing jitter. This analysis shows that the relative arrival time of the Ti:Sapphire laser and the x-ray pulses had a distribution with a standard deviation of approximately 120 fs. The largest contribution to the jitter noise spectrum was the locking of the laser oscillator to the reference RF of the accelerator, which suggests that simple technical improvements could reduce the jitter to better than 50 fs.

Published
2010
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17. Molecular frame Auger electron energy spectrum from N2

Author

Cryan, J P, primary, Glownia, J M, additional, Andreasson, J, additional, Belkacem, A, additional, Berrah, N, additional, Blaga, C I, additional, Bostedt, C, additional, Bozek, J, additional, Cherepkov, N A, additional, DiMauro, L F, additional, Fang, L, additional, Gessner, O, additional, Gühr, M, additional, Hajdu, J, additional, Hertlein, M P, additional, Hoener, M, additional, Kornilov, O, additional, Marangos, J P, additional, March, A M, additional, McFarland, B K, additional, Merdji, H, additional, Messerschmidt, M, additional, Petrović, V S, additional, Raman, C, additional, Ray, D, additional, Reis, D A, additional, Semenov, S K, additional, Trigo, M, additional, White, J L, additional, White, W, additional, Young, L, additional, Bucksbaum, P H, additional, and Coffee, R N, additional

Published
2012
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18. Auger Electron Angular Distribution of Double Core-Hole States in the Molecular Reference Frame

Author

Cryan, James P., primary, Glownia, J. M., additional, Andreasson, J., additional, Belkacem, A., additional, Berrah, N., additional, Blaga, C. I., additional, Bostedt, C., additional, Bozek, J., additional, Buth, C., additional, DiMauro, L. F., additional, Fang, L., additional, Gessner, O., additional, Guehr, M., additional, Hajdu, J., additional, Hertlein, M. P., additional, Hoener, M., additional, Kornilov, O., additional, Marangos, J. P., additional, March, A. M., additional, McFarland, B. K., additional, Merdji, H., additional, Petrović, V. S., additional, Raman, C., additional, Ray, D., additional, Reis, D., additional, Tarantelli, F., additional, Trigo, M., additional, White, J. L., additional, White, W., additional, Young, L., additional, Bucksbaum, P. H., additional, and Coffee, R. N., additional

Published
2010
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19. Time-resolved pump-probe experiments at the LCLS

Author

Glownia, James M., primary, Cryan, J., additional, Andreasson, J., additional, Belkacem, A., additional, Berrah, N., additional, Blaga, C. I., additional, Bostedt, C., additional, Bozek, J., additional, DiMauro, L. F., additional, Fang, L., additional, Frisch, J., additional, Gessner, O., additional, Gühr, M., additional, Hajdu, J., additional, Hertlein, M. P., additional, Hoener, M., additional, Huang, G., additional, Kornilov, O., additional, Marangos, J. P., additional, March, A. M., additional, McFarland, B. K., additional, Merdji, H., additional, Petrovic, V. S., additional, Raman, C., additional, Ray, D., additional, Reis, D. A., additional, Trigo, M., additional, White, J. L., additional, White, W., additional, Wilcox, R., additional, Young, L., additional, Coffee, R. N., additional, and Bucksbaum, P. H., additional

Published
2010
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22. X-ray absorption in neon modulated by a strong laser pulse

Author

Hertlein, M P, primary, Glover, T E, additional, Allison, T K, additional, Tilborg, J van, additional, Rude, B S, additional, Belkacem, A, additional, Southworth, S H, additional, Kanter, E P, additional, Krässig, B, additional, Varma, H R, additional, Santra, R, additional, and Young, L, additional

Published
2009
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23. Controlling X-rays with light

Author

Glover, T. E., primary, Hertlein, M. P., additional, Southworth, S. H., additional, Allison, T. K., additional, van Tilborg, J., additional, Kanter, E. P., additional, Krässig, B., additional, Varma, H. R., additional, Rude, B., additional, Santra, R., additional, Belkacem, A., additional, and Young, L., additional

Published
2009
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27. Fragmentation pathways for selected electronic states of the acetylene dication

Author

Osipov, T, primary, Rescigno, T N, additional, Weber, T, additional, Miyabe, S, additional, Jahnke, T, additional, Alnaser, A S, additional, Hertlein, M P, additional, Jagutzki, O, additional, Schmidt, L Ph H, additional, Schöffler, M, additional, Foucar, L, additional, Schössler, S, additional, Havermeier, T, additional, Odenweller, M, additional, Voss, S, additional, Feinberg, B, additional, Landers, A L, additional, Prior, M H, additional, Dörner, R, additional, Cocke, C L, additional, and Belkacem, A, additional

Published
2008
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28. Molecular frame Auger electron energy spectrum from N2.

Author

Cryan, J. P., Glownia, J. M., Andreasson, J., Belkacem, A., Berrah, N., Blaga, C. I., Bostedt, C., Bozek, J., Cherepkov, N. A., DiMauro, L. F., Fang, L., Gessner, O., Gühr, M., Hajdu, J., Hertlein, M. P., Hoener, M., Kornilov, O., Marangos, J. P., March, A. M., and McFarland, B. K.

Subjects
AUGER electron spectroscopy, NITROGEN, PHOTOIONIZATION, PHOTONS, ELECTRON emission, ANGULAR distribution (Nuclear physics)
Abstract

Here we present the first angle-resolved, non-resonant (normal) Auger spectra for impulsively aligned nitrogen molecules. We have measured the angular pattern of Auger electron emission following K-shell photoionization by 1.1 keV photons from the Linac Coherent Light Source (LCLS). Using strong-field-induced molecular alignment to make molecular frame measurements is equally effective for both repulsive and quasi-bound final states. The capability to resolve Auger emission angular distributions in the molecular frame of reference provides a new tool for spectral assignments in congested Auger electron spectra that takes advantage of the symmetries of the final diction states. Based on our experimental results and theoretical predictions, we propose the assignment of the spectral features in the Auger electron spectrum. [ABSTRACT FROM AUTHOR]

Published
2012
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29. Controlling X-rays with light.

Author

Glover, T. E., Hertlein, M. P., Southworth, S. H., Allison, T. K., van Tilborg, J., Kanter, E. P., Krässig, B., Varma, H. R., Rude, B., Santra, R., Belkacem, A., and Young, L.

Subjects
*X-rays, *ELECTROMAGNETIC waves, *WAVELENGTHS, *LIGHT sources, *PHOTOELECTRICITY, *MOLECULAR dynamics
Abstract

Ultrafast X-ray science is an exciting frontier that promises the visualization of electronic, atomic and molecular dynamics on atomic time and length scales. A largely unexplored area of ultrafast X-ray science is the use of light to control how X-rays interact with matter. To extend control concepts established for long-wavelength probes to the X-ray regime, the optical control field must drive a coherent electronic response on a timescale comparable to femtosecond core-hole lifetimes. An intense field is required to achieve this rapid response. Here, an intense optical control pulse is observed to efficiently modulate photoelectric absorption for X-rays and to create an ultrafast transparency window. We demonstrate an application of X-ray transparency relevant to ultrafast X-ray sources: an all-photonic temporal cross-correlation measurement of a femtosecond X-ray pulse. The ability to control X-ray–matter interactions with light will create new opportunities for present and next-generation X-ray light sources. [ABSTRACT FROM AUTHOR]

Published
2010
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32. Seasonal Development of Leptopilina boulardi (Hymenoptera: Eucoilidae) and Its Hosts, Drosophila melanogaster and D. simulans (Diptera: Drosophilidae), in California

Author

Hertlein, M. B.

Abstract

Laboratory and field studies conducted during 1982–85 examined seasonal development of Leptopilina boulardi Barbotin et al. and its fly hosts, Drosophila melanogaster Meigen and D. simulans Sturtevant. in northern California. Both fly species overwintered as long-lived fecund adults, presumably in a state of quiescence; no diapause was detected. In contrast, L. boulardi entered hibernal diapause as fifth instars within host puparia. In spring, reproductive activity of D. melanogaster and D. simulans resumed 2–3 months before reappearance of L. boulardi. Comparative developmental studies indicate that D. melanogaster and D. simulans have slightly lower thermal thresholds than their parasitoid (11.4 and 10.6°C, respectively, versus 12.8°C). and require significantly fewer degree-days (DD) to complete development from egg to adult (149 DD and 144 DD, respectively. versus 252 DD). These results indicate that the biological-control potential of L. boulardi is limited in northern California by the parasitoid's imperfect synchrony with seasonal occurrence and developmental cycles of its hosts.

Published
1986
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33. Variable Patch Times and the Functional Response of Leptopilina boulardi (Hymenoptera: Eucoilidae)

Author

Hertlein, M. B. and Thorarinsson, K.

Abstract

The functional response of Leptopilina boulardi Barbotin et al. to variations in density of its major natural host, Drosophila melanogaster Meigen, was examined in the laboratory. A behavioral criterion was used to assess attempts by parasitoid females to leave experimental arenas; a patch visit was considered terminated whenever a searching female left the host medium for over 5 min. The results demonstrate density-dependent oviposition behavior in L. boulardi, apparently stemming from a tendency by parasitoid females to spend longer periods of time in patches containing higher densities of hosts, and to emigrate quickly from patches of low host density. However, the form of the functional response was ambiguous. Allowing parasitoid search times to vary among patches changes the spatial frame of functional response measurements and complicates their interpretation; a number of these complications are discussed.

Published
1987
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34. Molecular frame Auger electron energy spectrum from N2.

Author

Cryan, J. P., Glownia, J. M., Andreasson, J., Belkacem, A., Berrah, N., Blaga, C. I., Bostedt, C., Bozek, J., Cherepkov, N. A., DiMauro, L. F., Fang, L., Gessner, O., Gühr, M., Hajdu, J., Hertlein, M. P., Hoener, M., Kornilov, O., Marangos, J. P., March, A. M., and McFarland, B. K.

Subjects
*AUGER electron spectroscopy, *NITROGEN, *PHOTOIONIZATION, *PHOTONS, *ELECTRON emission, *ANGULAR distribution (Nuclear physics)
Abstract

Here we present the first angle-resolved, non-resonant (normal) Auger spectra for impulsively aligned nitrogen molecules. We have measured the angular pattern of Auger electron emission following K-shell photoionization by 1.1 keV photons from the Linac Coherent Light Source (LCLS). Using strong-field-induced molecular alignment to make molecular frame measurements is equally effective for both repulsive and quasi-bound final states. The capability to resolve Auger emission angular distributions in the molecular frame of reference provides a new tool for spectral assignments in congested Auger electron spectra that takes advantage of the symmetries of the final diction states. Based on our experimental results and theoretical predictions, we propose the assignment of the spectral features in the Auger electron spectrum. [ABSTRACT FROM AUTHOR]

Published
2012
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35. Ultrafast evolution and transient phases of a prototype out-of-equilibrium Mott-Hubbard material.

Author

Lantz G, Mansart B, Grieger D, Boschetto D, Nilforoushan N, Papalazarou E, Moisan N, Perfetti L, Jacques VL, Le Bolloc'h D, Laulhé C, Ravy S, Rueff JP, Glover TE, Hertlein MP, Hussain Z, Song S, Chollet M, Fabrizio M, and Marsi M

Abstract

The study of photoexcited strongly correlated materials is attracting growing interest since their rich phase diagram often translates into an equally rich out-of-equilibrium behaviour. With femtosecond optical pulses, electronic and lattice degrees of freedom can be transiently decoupled, giving the opportunity of stabilizing new states inaccessible by quasi-adiabatic pathways. Here we show that the prototype Mott-Hubbard material V 2 O 3 presents a transient non-thermal phase developing immediately after ultrafast photoexcitation and lasting few picoseconds. For both the insulating and the metallic phase, the formation of the transient configuration is triggered by the excitation of electrons into the bonding a 1g orbital, and is then stabilized by a lattice distortion characterized by a hardening of the A 1g coherent phonon, in stark contrast with the softening observed upon heating. Our results show the importance of selective electron-lattice interplay for the ultrafast control of material parameters, and are relevant for the optical manipulation of strongly correlated systems.

Published
2017
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