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Title: Tracing intermolecular Coulombic decay of carbon-dioxide dimers and oxygen dimers after valence photoionization

Abstract

In this study, we have conducted an experimental study on the photo double ionization (PDI) of carbon-dioxide dimers at photon energies of 37 and 55 eV and oxygen dimers at photon energies of 38, 41.5, and 46 eV, while focusing on the dissociation dynamics upon single-photon absorption. The investigation was performed by applying the cold-target recoil-ion momentum spectroscopy method in order to collect and record the three-dimensional momenta of the ionic fragments and emitted electrons from the dissociating dimer in coincidence. The kinetic-energy release upon fragmentation and the electron angular distributions in the laboratory and body-fixed frames, as well as the relative electron-electron emission angle, show unambiguous experimental evidence of intermolecular Coulombic decay (ICD) in carbon-dioxide dimers upon photoionization below and above the double-ionization threshold of CO 2 monomers. The PDI of oxygen dimers is less conclusive and shows contributions from ICD and knock-off ionization mechanisms. As for atomic dimers, the present results reveal that ICD in CO 2 dimers after valence PDI can also serve as a source for low-energy electrons, known to be very relevant in biological systems, cells, and tissues.

Authors:
 [1];  [1];  [1];  [1];  [2];  [2];  [1];  [3];  [4];  [5];  [5];  [5];  [6];  [6];  [6];  [6];  [6];  [6];  [1];  [1]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
  3. Auburn Univ., AL (United States)
  4. Univ. of Nevada, Reno, NV (United States)
  5. Kansas State Univ., Manhattan, KS (United States)
  6. Institut für Kernphysik, Goethe-Universitaet (Germany)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division
OSTI Identifier:
1508067
Alternate Identifier(s):
OSTI ID: 1507178
Grant/Contract Number:  
AC02-05CH11231; FG02-86ER13491
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review A
Additional Journal Information:
Journal Volume: 99; Journal Issue: 4; Journal ID: ISSN 2469-9926
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS

Citation Formats

Iskandar, W., Gatton, A. S., Gaire, B., Sturm, F. P., Larsen, K. A., Champenois, E. G., Shivaram, N., Moradmand, A., Williams, J. B., Berry, B., Severt, T., Ben-Itzhak, I., Metz, D., Sann, H., Weller, M., Schoeffler, M., Jahnke, T., Dörner, R., Slaughter, D., and Weber, Th. Tracing intermolecular Coulombic decay of carbon-dioxide dimers and oxygen dimers after valence photoionization. United States: N. p., 2019. Web. doi:10.1103/physreva.99.043414.
Iskandar, W., Gatton, A. S., Gaire, B., Sturm, F. P., Larsen, K. A., Champenois, E. G., Shivaram, N., Moradmand, A., Williams, J. B., Berry, B., Severt, T., Ben-Itzhak, I., Metz, D., Sann, H., Weller, M., Schoeffler, M., Jahnke, T., Dörner, R., Slaughter, D., & Weber, Th. Tracing intermolecular Coulombic decay of carbon-dioxide dimers and oxygen dimers after valence photoionization. United States. doi:10.1103/physreva.99.043414.
Iskandar, W., Gatton, A. S., Gaire, B., Sturm, F. P., Larsen, K. A., Champenois, E. G., Shivaram, N., Moradmand, A., Williams, J. B., Berry, B., Severt, T., Ben-Itzhak, I., Metz, D., Sann, H., Weller, M., Schoeffler, M., Jahnke, T., Dörner, R., Slaughter, D., and Weber, Th. Mon . "Tracing intermolecular Coulombic decay of carbon-dioxide dimers and oxygen dimers after valence photoionization". United States. doi:10.1103/physreva.99.043414.
@article{osti_1508067,
title = {Tracing intermolecular Coulombic decay of carbon-dioxide dimers and oxygen dimers after valence photoionization},
author = {Iskandar, W. and Gatton, A. S. and Gaire, B. and Sturm, F. P. and Larsen, K. A. and Champenois, E. G. and Shivaram, N. and Moradmand, A. and Williams, J. B. and Berry, B. and Severt, T. and Ben-Itzhak, I. and Metz, D. and Sann, H. and Weller, M. and Schoeffler, M. and Jahnke, T. and Dörner, R. and Slaughter, D. and Weber, Th.},
abstractNote = {In this study, we have conducted an experimental study on the photo double ionization (PDI) of carbon-dioxide dimers at photon energies of 37 and 55 eV and oxygen dimers at photon energies of 38, 41.5, and 46 eV, while focusing on the dissociation dynamics upon single-photon absorption. The investigation was performed by applying the cold-target recoil-ion momentum spectroscopy method in order to collect and record the three-dimensional momenta of the ionic fragments and emitted electrons from the dissociating dimer in coincidence. The kinetic-energy release upon fragmentation and the electron angular distributions in the laboratory and body-fixed frames, as well as the relative electron-electron emission angle, show unambiguous experimental evidence of intermolecular Coulombic decay (ICD) in carbon-dioxide dimers upon photoionization below and above the double-ionization threshold of CO2 monomers. The PDI of oxygen dimers is less conclusive and shows contributions from ICD and knock-off ionization mechanisms. As for atomic dimers, the present results reveal that ICD in CO2 dimers after valence PDI can also serve as a source for low-energy electrons, known to be very relevant in biological systems, cells, and tissues.},
doi = {10.1103/physreva.99.043414},
journal = {Physical Review A},
number = 4,
volume = 99,
place = {United States},
year = {2019},
month = {4}
}

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This content will become publicly available on April 15, 2020
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