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Title: Two-photon double ionization of atomic beryllium with ultrashort laser pulses

Journal Article · · Physical Review A - Atomic, Molecular, and Optical Physics
 [1];  [2];  [3];  [4];  [5]
  1. California State Univ. Maritime Academy (Cal Maritime), Vallejo, CA (United States). Dept. of Science and Mathematics
  2. Autonomous Univ. of Madrid (Spain). Dept. of Chemistry
  3. IMDEA Nanoscience Inst., Madrid (Spain); Autonomous Univ. of Madrid (Spain). Dept. of Chemistry and Condensed Matter Physics Center (IFIMAC)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Division
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Division; Univ. of California, Davis, CA (United States). Dept. of Chemistry
+ Show Author Affiliations

Here, we investigate the two-photon double ionization of beryllium atom induced by ultrashort pulses. We use a time-dependent formalism to evaluate the ionization amplitudes and generalized cross sections for the ejection of the 2s2 valence shell electrons in the presence of a fully occupied 1s2 frozen core shell. The relative contributions of the two-photon direct and sequential process are systematically explored by varying both pulse duration and central frequency. The energy and angular differential ionization yields reveal the signatures of both mechanisms, as well as the role of electron correlation in both the single and double ionization continua. In contrast with previous results on the helium atom, the presence of an electronic core strongly affects the final state leading to back-to-back electron emission even in the a priori less correlated two-photon sequential mechanism. In particular, a dominant pathway via excitation ionization through the Be+(2p) determines the profiles and pulse-duration dependencies of the energy and angle differential yields.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division; National Science Foundation (NSF): European Research Council (ERC); Ministry of Economy and Enterprise (MINECO)
Contributing Organization:
Barcelona Supercomputing Center (BSC) (Spain)
Grant/Contract Number:
AC02-05CH11231; SC0007182; PHY-1509971; XCHEM 290853; MC-ITN CORINF; MC-RG ATTOTREND FP7-PEOPLE-268284; XLIC CM1204; FIS2013-42002-R; PIM2010EEC-00751
OSTI ID:
1465398
Alternate ID(s):
OSTI ID: 1225237
Journal Information:
Physical Review A - Atomic, Molecular, and Optical Physics, Vol. 92, Issue 5; Related Information: © 2015 American Physical Society.; ISSN 1050-2947
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 6 works
Citation information provided by
Web of Science

References (36)

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Experiments at FLASH
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  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 601, Issue 1-2 https://doi.org/10.1016/j.nima.2008.12.202
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The quantum chemistry of attosecond molecular science journal July 2019

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74 ATOMIC AND MOLECULAR PHYSICS