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

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 2s 2 valence shell electrons in the presence of a fully occupied 1s 2 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.
Authors:
 [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
Publication Date:
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
Type:
Accepted Manuscript
Journal Name:
Physical Review. A
Additional Journal Information:
Journal Volume: 92; Journal Issue: 5; Related Information: © 2015 American Physical Society.; Journal ID: ISSN 1050-2947
Publisher:
American Physical Society (APS)
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; National Science Foundation (NSF): European Research Council (ERC); Ministry of Economy and Enterprise (MINECO)
Contributing Orgs:
Barcelona Supercomputing Center (BSC) (Spain)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS
OSTI Identifier:
1465398
Alternate Identifier(s):
OSTI ID: 1225237