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1. Electron localization in dissociating $H_2^+$ by retroaction of a photoelectron onto its source

Author

Waitz, M., Aslitürk, D., Wechselberger, N., Gill, H. K., Rist, J., Wiegandt, F., Goihl, C., Kastirke, G., Weller, M., Bauer, T., Metz, D., Sturm, F. P., Voigtsberger, J., Zeller, S., Trinter, F., Schiwietz, G., Weber, T., Williams, J. B., Schöffler, M. S., Schmidt, L. Ph. H., Jahnke, T., and Dörner, R.

Subjects
Physics - Atomic Physics, Physics - Atomic and Molecular Clusters
Abstract

We investigate the dissociation of $H_2^+$ into a proton and a $H^0$ after single ionization with photons of an energy close to the threshold. We find that the $p^+$ and the $H^0$ do not emerge symmetrically in case of the $H_2^+$ dissociating along the $1s\sigma_g$ ground state. Instead, a preference for the ejection of the $p^+$ in the direction of the escaping photoelectron can be observed. This symmetry breaking is strongest for very small electron energies. Our experiment is consistent with a recent prediction by Serov and Kheifets [Phys. Rev. A 89, 031402 (2014)]. In their model, which treats the photoelectron classically, the symmetry breaking is induced by the retroaction of the long range Coulomb potential onto the dissociating $H_2^+$., Comment: Accepted for publication in Phys.Rev.Lett. 1/11/2016

Published
2016
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2. Imaging the He$_2$ quantum halo state using a free electron laser

Author

Zeller, S., Kunitski, M., Voigtsberger, J., Kalinin, A., Schottelius, A., Schober, C., Waitz, M., Sann, H., Hartung, A., Bauer, T., Pitzer, M., Trinter, F., Goihl, C., Janke, C., Richter, M., Kastirke, G., Weller, M., Czasch, A., Kitzler, M., Braune, M., Grisenti, R. E., Schöllkopf, W., Schmidt, L. Ph. H., Schöffer, M., Williams, J. B., Jahnke, T., and Dörner, R.

Subjects
Physics - Atomic Physics, Nuclear Experiment, Physics - Atomic and Molecular Clusters, Physics - Chemical Physics
Abstract

We report on coulomb explosion imaging of the wavefunction of the quantum halo system He$_2$. Each atom of this system is ionized by tunnelionization in a femto second laser pulse and in a second experiment by single photon ionization employing a free electron laser. We visualize the exponential decay of the probability density of the tunneling particle over distance for over two orders of magnitude up to an internuclear distance of 250 {\AA}. By fitting the slope of the density in the tunneling regime we obtain a binding energy of 151.9 $\pm$ 13.3 neV, which is in agreement with most recent calculations., Comment: 11 pages, 5 figures

Published
2016
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3. Quasi-molecular electron promotion beyond the 1s$\sigma$ and 2p$\pi$ channels in slow collisions of He$^{2+}$ and He

Author

Schmidt, L. Ph. H., Schöffler, M. S., Goihl, C., Jahnke, T., Schmidt-Böcking, H., and Dörner, R.

Subjects
Physics - Atomic Physics
Abstract

The electron emission pattern of transfer-ionization in collisions of He$^{2+}$ with He was investigated for impact velocities between 0.53 a.u. and 0.77 a.u. (7 keV/u - 15 keV/u) employing recoil-ion momentum spectroscopy. This process is known to be dominated by the promotion of the 2p$\pi$ molecular orbital into the continuum which results in "banana" shaped areas of high electron momentum densities extending from the target to the projectile in velocity space in the collision plain. Asymmetries are explained by a coherent superposition of the 2p$\pi$ channel of the quasi molecular promotion with the 1s$\sigma$ channel. Here we report on an additional contribution of higher angular momentum molecular states for close collisions which emerge at smaller impact velocities. They show up as highly structured electron emission patterns in the plane perpendicular to the direction of impact.

Published
2015
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4. Electron Localization in Dissociating H2+ by Retroaction of a Photoelectron onto Its Source

Author

Waitz, M, Aslitürk, D, Wechselberger, N, Gill, HK, Rist, J, Wiegandt, F, Goihl, C, Kastirke, G, Weller, M, Bauer, T, Metz, D, Sturm, FP, Voigtsberger, J, Zeller, S, Trinter, F, Schiwietz, G, Weber, T, Williams, JB, Schöffler, MS, Schmidt, L Ph H, Jahnke, T, and Dörner, R

Subjects
Atomic, Molecular and Optical Physics, Physical Sciences, Mathematical Sciences, Engineering, General Physics, Mathematical sciences, Physical sciences
Abstract

We investigate the dissociation of H_{2}^{+} into a proton and a H^{0} after single ionization with photons of an energy close to the threshold. We find that the p^{+} and the H^{0} do not emerge symmetrically in the case of the H_{2}^{+} dissociating along the 1sσ_{g} ground state. Instead, a preference for the ejection of the p^{+} in the direction of the escaping photoelectron can be observed. This symmetry breaking is strongest for very small electron energies. Our experiment is consistent with a recent prediction by Serov and Kheifets [Phys. Rev. A 89, 031402 (2014)]. In their model, which treats the photoelectron classically, the symmetry breaking is induced by the retroaction of the long-range Coulomb potential onto the dissociating H_{2}^{+}.

Published
2016

5. Interatomic-Coulombic-decay-induced recapture of photoelectrons in helium dimers

Author

Burzynski, P., Trinter, F., Williams, J. B., Weller, M., Waitz, M., Pitzer, M., Voigtsberger, J., Schober, C., Kastirke, G., Müller, C., Goihl, C., Wiegandt, F., Wallauer, R., Kalinin, A., Schmidt, L. Ph. H., Schöffler, M., Schiwietz, G., Sisourat, N., Jahnke, T., and Dörner, R.

Subjects
Physics - Atomic and Molecular Clusters
Abstract

We investigate the onset of photoionization shakeup induced interatomic Coulombic decay (ICD) in He2 at the He+*(n = 2) threshold by detecting two He+ ions in coincidence. We find this threshold to be shifted towards higher energies compared to the same threshold in the monomer. The shifted onset of ion pairs created by ICD is attributed to a recapture of the threshold photoelectron after the emission of the faster ICD electron., Comment: 5 Pages, 2 Figures

Published
2014
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6. Vortices associated with the wave function of a single electron emitted in slow ion-atom collisions

Author

Schmidt, L. Ph. H., Goihl, C., Metz, D., Schmidt-Böcking, H., Dörner, R., Ovchinnikov, S. Yu., Macek, J. H., and Schultz, D. R.

Subjects
Physics - Atomic Physics
Abstract

We present measurements and calculations of the momentum distribution of electrons emitted during the ion-atom collision 10 keV/u $He^{2+}+He \rightarrow He^{+} + He^{2+} + e^{-}$, which show rich structures for ion scattering angles above 2 mrad arising dominantly from two-electron states. Our calculations reveal that minima in the measured distributions are zeros in the electronic probability density resulting from vortices in the electronic current.

Published
2014
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7. Vibrationally Resolved Decay Width of Interatomic Coulombic Decay in HeNe

Author

Trinter, F., Williams, J. B., Weller, M., Waitz, M., Pitzer, M., Voigtsberger, J., Schober, C., Kastirke, G., Müller, C., Goihl, C., Burzynski, P., Wiegandt, F., Wallauer, R., Kalinin, A., Schmidt, L. Ph. H., Schöffler, M. S., Chiang, Y. -C., Gokhberg, K., Jahnke, T., and Dörner, R.

Subjects
Physics - Atomic and Molecular Clusters, Physics - Atomic Physics
Abstract

We investigate the ionization of HeNe from below the He 1s3p excitation to the He ionization threshold. We observe HeNe$^+$ ions with an enhancement by more than a factor of 60 when the He side couples resonantly to the radiation field. These ions are an experimental proof of a two-center resonant photoionization mechanism predicted by Najjari et al. [Phys. Rev. Lett. 105, 153002 (2010)]. Furthermore, our data provide electronic and vibrational state resolved decay widths of interatomic Coulombic decay (ICD) in HeNe dimers. We find that the ICD lifetime strongly increases with increasing vibrational state., Comment: 7 pages, 5 figures

Published
2013
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8. A measurement of the evolution of Interatomic Coulombic Decay in the time domain

Author

Trinter, F., Williams, J. B., Weller, M., Waitz, M., Pitzer, M., Voigtsberger, J., Schober, C., Kastirke, G., Müller, C., Goihl, C., Burzynski, P., Wiegandt, F., Bauer, T., Wallauer, R., Sann, H., Kalinin, A., Schmidt, L. Ph. H., Schöffler, M., Sisourat, N., and Jahnke, T.

Subjects
Physics - Atomic Physics, Physics - Atomic and Molecular Clusters
Abstract

During the last 15 years a novel decay mechanism of excited atoms has been discovered and investigated. This so called ''Interatomic Coulombic Decay'' (ICD) involves the chemical environment of the electronically excited atom: the excitation energy is transferred (in many cases over long distances) to a neighbor of the initially excited particle usually ionizing that neighbor. It turned out that ICD is a very common decay route in nature as it occurs across van-der-Waals and hydrogen bonds. The time evolution of ICD is predicted to be highly complex, as its efficiency strongly depends on the distance of the atoms involved and this distance typically changes during the decay. Here we present the first direct measurement of the temporal evolution of ICD using a novel experimental approach., Comment: 6 pages, 4 figures, submitted to PRL

Published
2013
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9. Direct determination of molecular handedness via coulomb explosion imaging

Author

Pitzer, M, Kunitski, M, Kastirke, G, Jahnke, T, Bauer, T, Goihl, C, Trinter, F, Schober, C, Henrichs, K, Becht, J, Zeller, S, Gassert, H, Waitz, M, Kuhlins, A, Wiegandt, F, Wallauer, R, Schmidt, L Ph H, Mazenauer, Manuel, Spenger, Benjamin, Marquardt, S, Schmidt-Böcking, H, Stohner, Jürgen, Dörner, R, Schöffler, M S, Berger, R, Pitzer, M, Kunitski, M, Kastirke, G, Jahnke, T, Bauer, T, Goihl, C, Trinter, F, Schober, C, Henrichs, K, Becht, J, Zeller, S, Gassert, H, Waitz, M, Kuhlins, A, Wiegandt, F, Wallauer, R, Schmidt, L Ph H, Mazenauer, Manuel, Spenger, Benjamin, Marquardt, S, Schmidt-Böcking, H, Stohner, Jürgen, Dörner, R, Schöffler, M S, and Berger, R

Published
2018

10. Direct determination of molecular handedness via coulomb explosion imaging

Author

Pitzer, M., Kunitski, M., Kastirke, G., Jahnke, T., Bauer, T., Goihl, C., Trinter, F., Schober, C., Henrichs, K., Becht, J., Zeller, S., Gassert, H., Waitz, M., Kuhlins, A., Wiegandt, F., Wallauer, R., Schmidt, L.Ph.H., Mazenauer, M., Spenger, B., Marquardt, S., Schmidt-Böcking, H., Stohner, J., Dörner, R., Schöffler, M.S., Berger, R., Pitzer, M., Kunitski, M., Kastirke, G., Jahnke, T., Bauer, T., Goihl, C., Trinter, F., Schober, C., Henrichs, K., Becht, J., Zeller, S., Gassert, H., Waitz, M., Kuhlins, A., Wiegandt, F., Wallauer, R., Schmidt, L.Ph.H., Mazenauer, M., Spenger, B., Marquardt, S., Schmidt-Böcking, H., Stohner, J., Dörner, R., Schöffler, M.S., and Berger, R.

Abstract

In this work, we show that the direct determination of a chiral molecule's absolute configuration can be achieved with Coulomb Explosion Imaging in a COLTRIMS reaction microscope. We compare the results after ionisation with femto-second laser pulses and with X-ray synchrotron light. Different fragmentation pathways of the prototypical chiral molecule CHBrClF are identified that carry information on the handedness. The applicabilty of the technique towards bigger molecules is discussed.

Published
2018

11. Single ionization of Helium at 0.5 - 2 MeV proton impact: On the quest for projectile coherence effects

Author

Gatzke, J., primary, Navarrete, F., additional, Ciappina, M., additional, Gatzke, H., additional, Chuluunbaatar, O., additional, Zaytsev, S. A., additional, Bulychev, A. A., additional, Kouzakov, K. A., additional, Galstyan, A., additional, Waitz, M., additional, Kim, H.-K., additional, Bauer, T., additional, Laucke, A., additional, Eckart, S., additional, Kastirke, G., additional, Müller, J., additional, Ritzer, M., additional, Bloch, E., additional, Richter, M., additional, Fehre, K., additional, Kunitski, M., additional, Müller, Ch., additional, Voigtsberger, J., additional, Rist, J., additional, Pahl, K., additional, Honig, M., additional, Pitzer, M., additional, Weller, M., additional, Vela Pérez, I., additional, Hoehl, J., additional, Nalin, G., additional, Grundmann, S., additional, Maschkiwitz, H., additional, Janke, C., additional, Zeller, S., additional, Goihl, C., additional, Herrman, Y., additional, Trabert, D., additional, Jahnke, T., additional, Schmidt, L. Ph. H., additional, Popov, Yu. V., additional, Dörner, R., additional, Barrachina, R. O., additional, and Schöffler, M. S., additional

Published
2017
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12. Born in weak fields: below-threshold photoelectron dynamics

Author

Williams, J B, primary, Saalmann, U, additional, Trinter, F, additional, Schöffler, M S, additional, Weller, M, additional, Burzynski, P, additional, Goihl, C, additional, Henrichs, K, additional, Janke, C, additional, Griffin, B, additional, Kastirke, G, additional, Neff, J, additional, Pitzer, M, additional, Waitz, M, additional, Yang, Y, additional, Schiwietz, G, additional, Zeller, S, additional, Jahnke, T, additional, and Dörner, R, additional

Published
2017
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13. Electron Localization in Dissociating H_{2}^{+} by Retroaction of a Photoelectron onto Its Source

Author

Waitz, M., Aslituerk, D., Wechselberger, N., Gill, H. K., Rist, J., Wiegandt, F., Goihl, C., Kastirke, G., Weller, M., Bauer, T., Metz, D., Sturm, F. P., Voigtsberger, J., Zeller, S., Trinter, F., Schiwietz, G., Weber, T., Williams, J. B., Schoeffler, M. S., Schmidt, L. Ph H., Jahnke, T., and Reinhard Doerner

Subjects
General Physics, Engineering, Atomic Physics (physics.atom-ph), Physical Sciences, Physics::Atomic and Molecular Clusters, FOS: Physical sciences, Physics - Atomic and Molecular Clusters, Physics::Chemical Physics, Atomic and Molecular Clusters (physics.atm-clus), Mathematical Sciences, Physics - Atomic Physics
Abstract

We investigate the dissociation of $H_2^+$ into a proton and a $H^0$ after single ionization with photons of an energy close to the threshold. We find that the $p^+$ and the $H^0$ do not emerge symmetrically in case of the $H_2^+$ dissociating along the $1s\sigma_g$ ground state. Instead, a preference for the ejection of the $p^+$ in the direction of the escaping photoelectron can be observed. This symmetry breaking is strongest for very small electron energies. Our experiment is consistent with a recent prediction by Serov and Kheifets [Phys. Rev. A 89, 031402 (2014)]. In their model, which treats the photoelectron classically, the symmetry breaking is induced by the retroaction of the long range Coulomb potential onto the dissociating $H_2^+$., Comment: Accepted for publication in Phys.Rev.Lett. 1/11/2016

Published
2015
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14. Delocalization of a Vacancy across Two Neon Atoms Bound by the van der Waals Force

Author

Sann, H., primary, Schober, C., additional, Mhamdi, A., additional, Trinter, F., additional, Müller, C., additional, Semenov, S. K., additional, Stener, M., additional, Waitz, M., additional, Bauer, T., additional, Wallauer, R., additional, Goihl, C., additional, Titze, J., additional, Afaneh, F., additional, Schmidt, L. Ph. H., additional, Kunitski, M., additional, Schmidt-Böcking, H., additional, Demekhin, Ph. V., additional, Cherepkov, N. A., additional, Schöffler, M. S., additional, Jahnke, T., additional, and Dörner, R., additional

Published
2016
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15. Erratum: Electron Localization in Dissociating H2+ by Retroaction of a Photoelectron onto Its Source [Phys. Rev. Lett. 116 , 043001 (2016)]

Author

Waitz, M., primary, Aslitürk, D., additional, Wechselberger, N., additional, Gill, H. K., additional, Rist, J., additional, Wiegandt, F., additional, Goihl, C., additional, Kastirke, G., additional, Weller, M., additional, Bauer, T., additional, Metz, D., additional, Sturm, F. P., additional, Voigtsberger, J., additional, Zeller, S., additional, Trinter, F., additional, Schiwietz, G., additional, Weber, T., additional, Williams, J. B., additional, Schöffler, M. S., additional, Schmidt, L. Ph. H., additional, Jahnke, T., additional, and Dörner, R., additional

Published
2016
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16. Imaging the Temporal Evolution of Molecular Orbitals during Ultrafast Dissociation

Author

Sann, H., primary, Havermeier, T., additional, Müller, C., additional, Kim, H.-K., additional, Trinter, F., additional, Waitz, M., additional, Voigtsberger, J., additional, Sturm, F., additional, Bauer, T., additional, Wallauer, R., additional, Schneider, D., additional, Weller, M., additional, Goihl, C., additional, Tross, J., additional, Cole, K., additional, Wu, J., additional, Schöffler, M. S., additional, Schmidt-Böcking, H., additional, Jahnke, T., additional, Simon, M., additional, and Dörner, R., additional

Published
2016
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18. Electron Localization in DissociatingH2+by Retroaction of a Photoelectron onto Its Source

Author

Waitz, M., primary, Aslitürk, D., additional, Wechselberger, N., additional, Gill, H. K., additional, Rist, J., additional, Wiegandt, F., additional, Goihl, C., additional, Kastirke, G., additional, Weller, M., additional, Bauer, T., additional, Metz, D., additional, Sturm, F. P., additional, Voigtsberger, J., additional, Zeller, S., additional, Trinter, F., additional, Schiwietz, G., additional, Weber, T., additional, Williams, J. B., additional, Schöffler, M. S., additional, Schmidt, L. Ph. H., additional, Jahnke, T., additional, and Dörner, R., additional

Published
2016
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19. Direct Determination of Molecular Handedness via Coulomb Explosion Imaging

Author

Pitzer, M, primary, Kunitski, M, additional, Kastirke, G, additional, Jahnke, T, additional, Bauer, T, additional, Goihl, C, additional, Trinter, F, additional, Schober, C, additional, Henrichs, K, additional, Becht, J, additional, Zeller, S, additional, Gassert, H, additional, Waitz, M, additional, Kuhlins, A, additional, Wiegandt, F, additional, Wallauer, R, additional, Schmidt, L Ph H, additional, Mazenauer, M, additional, Spenger, B, additional, Marquardt, S, additional, Schmidt-Böcking, H, additional, Stohner, J, additional, Dörner, R, additional, Schöffler, M S, additional, and Berger, R, additional

Published
2015
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20. Interatomic-Coulombic-decay-induced recapture of photoelectrons in helium dimers

Author

Burzynski, P., primary, Trinter, F., additional, Williams, J. B., additional, Weller, M., additional, Waitz, M., additional, Pitzer, M., additional, Voigtsberger, J., additional, Schober, C., additional, Kastirke, G., additional, Müller, C., additional, Goihl, C., additional, Wiegandt, F., additional, Wallauer, R., additional, Kalinin, A., additional, Schmidt, L. Ph. H., additional, Schöffler, M., additional, Schiwietz, G., additional, Sisourat, N., additional, Jahnke, T., additional, and Dörner, R., additional

Published
2014
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21. A measurement of the evolution of Interatomic Coulombic Decay in the time domain

Author

Trinter, F, primary, Williams, J B, additional, Weller, M, additional, Waitz, M, additional, Pitzer, M, additional, Voigtsberger, J, additional, Schober, C, additional, Kastirke, G, additional, Müller, C, additional, Goihl, C, additional, Burzynski, P, additional, Wiegandt, F, additional, Sann, H, additional, Wallauer, R, additional, Kalinin, A, additional, Schmidt, L, additional, Schöffler, M, additional, Sisourat, N, additional, and Jahnke, T, additional

Published
2014
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22. Transfer ionization of D+and He+projectiles with H2-molecules – electron emission dependency on the internuclear axis

Author

Schöffler, M S, primary, Waitz, M, additional, Kim, H-K, additional, Trinter, F, additional, Müller, C, additional, Goihl, C, additional, Pitzer, M, additional, Schober, C, additional, Voigtsberger, J, additional, Zeller, S, additional, Henrichs, K, additional, Honig, M, additional, Rist, J, additional, Gassert, H, additional, Weller, M, additional, Bauer, T, additional, Jahnke, T, additional, Williams, J B, additional, Schmidt, L Ph H, additional, Schmidt-Böcking, H, additional, and Dörner, R, additional

Published
2014
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24. Vibrationally Resolved Decay Width of Interatomic Coulombic Decay in HeNe

Author

Trinter, F., primary, Williams, J. B., additional, Weller, M., additional, Waitz, M., additional, Pitzer, M., additional, Voigtsberger, J., additional, Schober, C., additional, Kastirke, G., additional, Müller, C., additional, Goihl, C., additional, Burzynski, P., additional, Wiegandt, F., additional, Wallauer, R., additional, Kalinin, A., additional, Schmidt, L. Ph. H., additional, Schöffler, M. S., additional, Chiang, Y.-C., additional, Gokhberg, K., additional, Jahnke, T., additional, and Dörner, R., additional

Published
2013
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25. Evolution of Interatomic Coulombic Decay in the Time Domain

Author

Trinter, F., primary, Williams, J. B., additional, Weller, M., additional, Waitz, M., additional, Pitzer, M., additional, Voigtsberger, J., additional, Schober, C., additional, Kastirke, G., additional, Müller, C., additional, Goihl, C., additional, Burzynski, P., additional, Wiegandt, F., additional, Bauer, T., additional, Wallauer, R., additional, Sann, H., additional, Kalinin, A., additional, Schmidt, L. Ph. H., additional, Schöffler, M., additional, Sisourat, N., additional, and Jahnke, T., additional

Published
2013
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27. Quasimolecular electron promotion beyond the 1sσ and 2p▂ channels in slow collisions of He2+ and He.

Author

Schmidt, L. Ph. H., Schöffler, M., Goihl, C., Jahnke, T., Schmidt-Böcking, H., and Dörner, R.

Subjects
*COLLISIONS (Nuclear physics), *QUASI-molecular ions, *ANGULAR momentum (Nuclear physics)
Abstract

The electron emission pattern of transfer ionization in collisions of He2+ with He was investigated for impact velocities between 0.53 a.u. and 0.77 a.u. (7 keV/u-15 keV/u) employing recoil-ion momentum spectroscopy. This process is known to be dominated by the promotion of the 2pπ quasimolecular orbital into the continuum which results in banana-shaped areas of high electron momentum densities in the collision plane extending from the target to the projectile in velocity space. Asymmetries are explained by a coherent superposition of the 1sσ channel of quasimolecular promotion with the 2pπ channel. Here we report on additional contributions from channels of higher angular momentum which emerge at the smaller impact velocities. They show up as highly structured electron emission patterns in the plane perpendicular to the direction of impact. [ABSTRACT FROM AUTHOR]

Published
2016
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28. Delocalization of a Vacancy across Two Neon Atoms Bound by the van der Waals Force

Author

Markus Schöffler, C. Goihl, M. Waitz, Reinhard Dörner, Till Jahnke, C. Schober, T. Bauer, Florian Trinter, Maksim Kunitski, J. Titze, R. Wallauer, Ph. V. Demekhin, F. Afaneh, C. Müller, L. Ph. H. Schmidt, Mauro Stener, A. Mhamdi, Horst Schmidt-Böcking, N. A. Cherepkov, H. Sann, S. K. Semenov, Sann, H, Schober, C., Mhamdi, A., Trinter, F., Müller, C., Semenov, S. K., Stener, Mauro, Waitz, M., Bauer, T., Wallauer, R., Goihl, C., Titze, J., Afaneh, F., Schmidt, L. P. h. H., Kunitski, M., Schmidt Böcking, H., Demekhin, P. h. V., Cherepkov, N. A., Schöffler, M. S., Jahnke, T., and Dörner, R.

Subjects
DYNAMICS, PHOTOELECTRON ANGULAR-DISTRIBUTION, K-SHELL PHOTOIONIZATION, RECOIL-ION, MOMENTUM SPECTROSCOPY, EXCITED-STATES, MOLECULES, CO, MICROSCOPE, RESOLUTION, General Physics and Astronomy, chemistry.chemical_element, Photoionization, Photon energy, 01 natural sciences, Molecular physics, 010305 fluids & plasmas, Neon, symbols.namesake, Delocalized electron, Ionization, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Van der Waals radius, Physics::Atomic Physics, 010306 general physics, Physics, Van der Waals strain, chemistry, symbols, Atomic physics, van der Waals force
Abstract

We experimentally study $2p$ photoionization of neon dimers (${\mathrm{Ne}}_{2}$) at a photon energy of $h\ensuremath{\nu}=36.56\text{ }\text{ }\mathrm{eV}$. By postselection of ionization events which lead to a dissociation into ${\mathrm{Ne}}^{+}+\mathrm{Ne}$ we obtain the photoelectron angular emission distribution in the molecular frame. This distribution is symmetric with respect to the direction of the charged vs neutral fragment. It shows an inverted Cohen-Fano double slit interference pattern of two spherical waves emitted coherently but with opposite phases from the two atoms of the dimer.

Published
2016

29. Electron Localization in Dissociating H2+ by Retroaction of a Photoelectron onto Its Source.

Author

Waitz, M., Aslitürk, D., Wechselberger, N., Gill, H. K., Rist, J., Wiegandt, F., Goihl, C., Kastirke, G., Weller, M., Bauer, T., Metz, D., Sturm, F. P., Voigtsberger, J., Zeller, S., Trinter, F., Schiwietz, G., Weber, T., Williams, J. B., Schöffler, M. S., and Schmidt, L. Ph. H.

Subjects
*PHOTOELECTRONS, *IONIZATION (Atomic physics), *SYMMETRY breaking
Abstract

We investigate the dissociation of H2+ into a proton and a H0 after single ionization with photons of an energy close to the threshold. We find that the p+ and the H0 do not emerge symmetrically in the case of the H2+ dissociating along the 1ssg ground state. Instead, a preference for the ejection of the p+ in the direction of the escaping photoelectron can be observed. This symmetry breaking is strongest for very small electron energies. Our experiment is consistent with a recent prediction by Serov and Kheifets [Phys. Rev. A 89, 031402 (2014)]. In their model, which treats the photoelectron classically, the symmetry breaking is induced by the retroaction of the long-range Coulomb potential onto the dissociating H2+. [ABSTRACT FROM AUTHOR]

Published
2016
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30. Absolute Configuration from Different Multifragmentation Pathways in Light-Induced Coulomb Explosion Imaging.

Author

Pitzer M, Kastirke G, Kunitski M, Jahnke T, Bauer T, Goihl C, Trinter F, Schober C, Henrichs K, Becht J, Zeller S, Gassert H, Waitz M, Kuhlins A, Sann H, Sturm F, Wiegandt F, Wallauer R, Schmidt LP, Johnson AS, Mazenauer M, Spenger B, Marquardt S, Marquardt S, Schmidt-Böcking H, Stohner J, Dörner R, Schöffler M, and Berger R

Abstract

The absolute configuration of individual small molecules in the gas phase can be determined directly by light-induced Coulomb explosion imaging (CEI). Herein, this approach is demonstrated for ionization with a single X-ray photon from a synchrotron light source, leading to enhanced efficiency and faster fragmentation as compared to previous experiments with a femtosecond laser. In addition, it is shown that even incomplete fragmentation pathways of individual molecules from a racemic CHBrClF sample can give access to the absolute configuration in CEI. This leads to a significant increase of the applicability of the method as compared to the previously reported complete break-up into atomic ions and can pave the way for routine stereochemical analysis of larger chiral molecules by light-induced CEI., (© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)

Published
2016
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