skip to main content

DOE PAGESDOE PAGES

Title: Alignment of the hydrogen molecule under intense laser fields

Alignment, dissociation and ionization of H 2 molecules in the ground or the electronically excited E,F state of the H 2 molecule are studied and contrasted using the Velocity Mapping Imaging (VMI) technique. Photoelectron images from nonresonant 7-, 8- and 9-photon radiation ionization of H 2 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 H 2 (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 H 2, as the laser intensity increases. Quantification of these effects allows us to extract the molecular polarizability of the H 2 (E,F) state, and yields a value of 103 ± 37 A.U.
Authors:
ORCiD logo [1] ; ORCiD logo [1] ;  [1] ; ORCiD logo [2] ;  [2] ;  [1]
  1. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
  2. Univ. of Crete (Greece)
Publication Date:
Report Number(s):
SAND-2017-2228J
Journal ID: ISSN 0021-9606; 651261; TRN: US1802885
Grant/Contract Number:
AC04-94AL85000
Type:
Accepted Manuscript
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 147; Journal Issue: 1; Journal ID: ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)
Research Org:
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS
OSTI Identifier:
1429741
Alternate Identifier(s):
OSTI ID: 1366766

Lopez, Gary V., Fournier, Martin, Jankunas, Justin, Spiliotis, Alexandros K., Rakitzis, T. Peter, and Chandler, David W.. Alignment of the hydrogen molecule under intense laser fields. United States: N. p., Web. doi:10.1063/1.4989935.
Lopez, Gary V., Fournier, Martin, Jankunas, Justin, Spiliotis, Alexandros K., Rakitzis, T. Peter, & Chandler, David W.. Alignment of the hydrogen molecule under intense laser fields. United States. doi:10.1063/1.4989935.
Lopez, Gary V., Fournier, Martin, Jankunas, Justin, Spiliotis, Alexandros K., Rakitzis, T. Peter, and Chandler, David W.. 2017. "Alignment of the hydrogen molecule under intense laser fields". United States. doi:10.1063/1.4989935. https://www.osti.gov/servlets/purl/1429741.
@article{osti_1429741,
title = {Alignment of the hydrogen molecule under intense laser fields},
author = {Lopez, Gary V. and Fournier, Martin and Jankunas, Justin and Spiliotis, Alexandros K. and Rakitzis, T. Peter and Chandler, David W.},
abstractNote = {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.},
doi = {10.1063/1.4989935},
journal = {Journal of Chemical Physics},
number = 1,
volume = 147,
place = {United States},
year = {2017},
month = {6}
}