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16 results on '"Kimmel, N"'

6. Fractal morphology, imaging and mass spectrometry of single aerosol particles in flight

Author

Loh, N. D., Hampton, C. Y., Martin, A. V., Starodub, D., Sierra, R. G., Barty, A., Aquila, A., Schulz, J., Lomb, L., Steinbrener, J., Shoeman, R. L., Kassemeyer, S., Bostedt, C., Bozek, J., Epp, S. W., Erk, B., Hartmann, R., Rolles, D., Rudenko, A., Rudek, B., Foucar, L., Kimmel, N., Weidenspointner, G., Hauser, G., Holl, P., Pedersoli, E., Liang, M., Hunter, M. M., Gumprecht, L., Coppola, N., Wunderer, C., Graafsma, H., Maia, F. R. N. C., Ekeberg, T., Hantke, M., Fleckenstein, H., Hirsemann, H., Nass, K., White, T. A., Tobias, H. J., Farquar, G. R., Benner, W. H., Hau-Riege, S. P., Reich, C., Hartmann, A., Soltau, H., Marchesini, S., Bajt, S., Barthelmess, M., Bucksbaum, P., Hodgson, K. O., Strüder, L., Ullrich, J., Frank, M., Schlichting, I., Chapman, H. N., and Bogan, M. J.

Published
2012
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10. Toward atomic resolution diffractive imaging of isolated molecules with X-ray free-electron lasers.

Author

Stern, S., Holmegaard, L., Filsinger, F., Rouzée, A., Rudenko, A., Johnsson, P., Martin, A. V., Barty, A., Bostedt, C., Bozek, J., Coffee, R., Epp, S., Erk, B., Foucar, L., Hartmann, R., Kimmel, N., Kühnel, K-U., Maurer, J., Messerschmidt, M., and Rudek, B.

Abstract

We give a detailed account of the theoretical analysis and the experimental results of an X-ray-diffraction experiment on quantum-state selected and strongly laser-aligned gas-phase ensembles of the prototypical large asymmetric rotor molecule 2,5-diiodobenzonitrile, performed at the Linac Coherent Light Source [Phys. Rev. Lett.112, 083002 (2014)]. This experiment is the first step toward coherent diffractive imaging of structures and structural dynamics of isolated molecules at atomic resolution, i.e., picometers and femtoseconds, using X-ray free-electron lasers. [ABSTRACT FROM AUTHOR]

Published
2014
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11. Nanoscale spin reversal by non-local angular momentum transfer following ultrafast laser excitation in ferrimagnetic GdFeCo.

Author

Graves, C. E., Reid, A. H., Wang, T., Wu, B., de Jong, S., Vahaplar, K., Radu, I., Bernstein, D. P., Messerschmidt, M., Müller, L., Coffee, R., Bionta, M., Epp, S. W., Hartmann, R., Kimmel, N., Hauser, G., Hartmann, A., Holl, P., Gorke, H., and Mentink, J. H.

Subjects
INDUSTRIAL lasers, MAGNETISM, EXCITATION spectrum, MICROSTRUCTURE, PHASE equilibrium
Abstract

Ultrafast laser techniques have revealed extraordinary spin dynamics in magnetic materials that equilibrium descriptions of magnetism cannot explain. Particularly important for future applications is understanding non-equilibrium spin dynamics following laser excitation on the nanoscale, yet the limited spatial resolution of optical laser techniques has impeded such nanoscale studies. Here we present ultrafast diffraction experiments with an X-ray laser that probes the nanoscale spin dynamics following optical laser excitation in the ferrimagnetic alloy GdFeCo, which exhibits macroscopic all-optical switching. Our study reveals that GdFeCo displays nanoscale chemical and magnetic inhomogeneities that affect the spin dynamics. In particular, we observe Gd spin reversal in Gd-rich nanoregions within the first picosecond driven by the non-local transfer of angular momentum from larger adjacent Fe-rich nanoregions. These results suggest that a magnetic material's microstructure can be engineered to control transient laser-excited spins, potentially allowing faster (~ 1 ps) spin reversal than in present technologies. [ABSTRACT FROM AUTHOR]

Published
2013
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12. Identification of twinned gas phase clusters by single-shot scattering with intense soft x-ray pulses.

Author

Rupp, D., Adolph, M., Gorkhover, T., Schorb, S., Wolter, D., Hartmann, R., Kimmel, N., Reich, C., Feigl, T., de Castro, A. R. B., Treusch, R., Strüder, L., Möller, T., and Bostedt, C.

Subjects
GAS phase reactions, X-ray scattering, FREE electron lasers, IONIZATION (Atomic physics), XENON
Abstract

Scattering experiments on xenon nanoclusters with high-intensity soft x-ray laser pulses from the Free-Electron LASer in Hamburg (FLASH) are performed to investigate different cluster morphologies in the gas phase. Three different types of scattering patterns can be identified. The most frequent pattern of concentric rings reflects the event of a single spherical cluster in focus. Fine interference rings similar to Newton rings appear when two clusters are illuminated at μm distance, revealing three-dimensional information about the location of the clusters. Between 10 and 30% of all hits show a previously unknown twin cluster configuration with two clusters in direct contact. Simulations of scattering patterns for twin clusters with different sizes of the two particles, degree of fusion and orientation in space allow us to explain all the observed patterns. [ABSTRACT FROM AUTHOR]

Published
2012
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13. Particle detection with PNCCDs.

Author

Andritschke, R., Meidinger, N., Elbs, J., Hartmann, R., Ziegler, A., Kimmel, N., Schachner, G., Ebermayer, S., Herrmann, S., Halker, O., Reiffers, J., Holl, P., Schopper, F., Struder, L., Soltau, H., Assmann, W., and Reinhardt, S.

Published
2010
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16. Nanoplasma Dynamics of Single Large Xenon Clusters Irradiated with Superintense X-Ray Pulses from the Linac Coherent Light Source Free-Electron Laser.

Author

Gorkhover, T., Adolph, M., Rupp, D., Schorb, S., Epp, S. W., Erk, B., Foucar, L., Hartmann, R., Kimmel, N., Kühnel, K.-U., Rolles, D., Rudek, B., Rudenkc, A., Andritschke, R., Aquila, A., Bozek, J. D., Coppola, N., Erke, T., Filsinger, F., and Gorke, H.

Subjects
*PLASMA dynamics, *XENON, *FREE electron lasers, *COHERENCE (Optics), *PARTICLE size distribution, *CLUSTER analysis (Statistics)
Abstract

The plasma dynamics of single mesoscopic Xe particles irradiated with intense femtosecond x-ray pulses exceeding 1016 W/cm2 from the Linac Coherent Light Source free-electron laser are investigated. Simultaneous recording of diffraction patterns and ion spectra allows eliminating the influence of the laser focal volume intensity and particle size distribution. The data show that for clusters illuminated with intense x-ray pulses, highly charged ionization fragments in a narrow distribution are created and that the nanoplasma recombination is efficiendy suppressed. [ABSTRACT FROM AUTHOR]

Published
2012
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