Two-photon double photoionization of atomic Mg by ultrashort pulses: Variation of angular distributions with pulse length

Bello, Roger Y.; Yip, Frank L.; Rescigno, Thomas N.; Lucchese, Robert R.; McCurdy, C. William

doi:10.1103/physreva.102.053107

Two-photon double photoionization of atomic Mg by ultrashort pulses: Variation of angular distributions with pulse length

Journal Article · Fri Nov 06 00:00:00 EST 2020 · Physical Review A

DOI:https://doi.org/10.1103/physreva.102.053107· OSTI ID:1785255

^[1]; ^[2]; Rescigno, Thomas N. ^[3]; ^[3]; McCurdy, C. William ^[1]

Univ. of California, Davis, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Division
California State Univ., Vallejo, CA (United States). Maritime Academy, Dept. of Science and Mathematics
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Division

We investigate the two-photon double ionization of atomic magnesium induced by ultrashort pulses. Though the initial and final state symmetries are comparable to the same process in helium, in stark contrast the range of photon energies for which nonsequential ionization is the only open pathway is narrow (less than 1 eV) in magnesium. Thus several sequential ionization pathways feature heavily in these processes. Nonetheless, it is found that for pulse durations between 0.25 and 2.0 fentoseconds, the joint angular dependence of the ejected electrons can depend sensitively on pulse length, varying between the strictly back-to-back ejection characteristic of nonsequential ionization to other distributions. The significance of excited-state correlating configurations in representing the initial state of magnesium is discussed in the light of their consequences for the resulting angular distributions at photon energies where sequential ionization can access intermediate states that lie nearby in energy, particularly for longer pulses.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Science Foundation (NSF)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1785255

Journal Information:: Physical Review A, Journal Name: Physical Review A Journal Issue: 5 Vol. 102; ISSN 2469-9926

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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