Alignment of the hydrogen molecule under intense laser fields

Lopez, Gary V.; Fournier, Martin; Jankunas, Justin; Spiliotis, Alexandros K.; Rakitzis, T. Peter; Chandler, David W.

doi:10.1063/1.4989935

Title: Alignment of the hydrogen molecule under intense laser fields

Journal Article · Thu Jun 01 00:00:00 EDT 2017 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.4989935· OSTI ID:1429741

^[1];

^[1]; Jankunas, Justin ^[1];

^[2]; Rakitzis, T. Peter ^[2]; Chandler, David W. ^[1]

Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Univ. of Crete (Greece)

Alignment, dissociation and ionization of H₂ molecules in the ground or the electronically excited E,F state of the H₂ molecule are studied and contrasted using the Velocity Mapping Imaging (VMI) technique. Photoelectron images from nonresonant 7-, 8- and 9-photon radiation ionization of H₂ show that the intense laser fields create ponderomotive shifts in the potential energy surfaces and distort the velocity of the emitted electrons that are produced from ionization. Photofragment images of H+ due to the dissociation mechanism that follows the 2-photon excitation into the (E,F; v = 0, J = 0, 1) electronic state show a strong dependence on laser intensity, which is attributed to the high polarizability of the H₂ (E,F) state. For transitions from the J = 0 state, particularly, we observe marked structure in the angular distribution, which we explain as the interference between the prepared J = 0 and Stark-mixed J = 2 rovibrational states of H₂, as the laser intensity increases. Quantification of these effects allows us to extract the molecular polarizability of the H₂ (E,F) state, and yields a value of 103 ± 37 A.U.

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Research Organization:: Sandia National Lab. (SNL-CA), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1429741

Alternate ID(s):: OSTI ID: 1366766

Report Number(s):: SAND-2017-2228J; 651261; TRN: US1802885

Journal Information:: Journal of Chemical Physics, Vol. 147, Issue 1; ISSN 0021-9606

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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