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

Yip, F. L.; Palacios, A.; Martín, F.; Rescigno, T. N.; McCurdy, C. W.

doi:10.1103/PhysRevA.92.053404

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

Journal Article · Thu Nov 05 00:00:00 EST 2015 · Physical Review A - Atomic, Molecular, and Optical Physics

DOI:https://doi.org/10.1103/PhysRevA.92.053404· OSTI ID:1465398

Yip, F. L. ^[1]; Palacios, A. ^[2]; Martín, F. ^[3]; Rescigno, T. N. ^[4]; McCurdy, C. W. ^[5]

California State Univ. Maritime Academy (Cal Maritime), Vallejo, CA (United States). Dept. of Science and Mathematics
Autonomous Univ. of Madrid (Spain). Dept. of Chemistry
IMDEA Nanoscience Inst., Madrid (Spain); Autonomous Univ. of Madrid (Spain). Dept. of Chemistry and Condensed Matter Physics Center (IFIMAC)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Division
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Division; Univ. of California, Davis, CA (United States). Dept. of Chemistry

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.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: Ministry of Economy and Enterprise (MINECO); National Science Foundation (NSF): European Research Council (ERC); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division

Contributing Organization:: Barcelona Supercomputing Center (BSC) (Spain)

Grant/Contract Number:: AC02-05CH11231; SC0007182

OSTI ID:: 1465398

Alternate ID(s):: OSTI ID: 1225237

Journal Information:: Physical Review A - Atomic, Molecular, and Optical Physics, Journal Name: Physical Review A - Atomic, Molecular, and Optical Physics Journal Issue: 5 Vol. 92; ISSN 1050-2947; ISSN PLRAAN

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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