Alignment-dependent ionization of hydrogen molecules in intense laser fields

Journal Article · Wed Jun 15 00:00:00 EDT 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.83.063409· OSTI ID:21550132

Jin, Ying-Jun; Toshima, Nobuyuki ^[1]; Tong, Xiao-Min ^[1]

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1. Institute of Materials Science, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573 (Japan)

Recent experiments showed that the alignment-dependent ionization probabilities of hydrogen molecules vary as a function of laser intensity, and the anisotropy deviates from the prediction of the molecular tunneling ionization model (MO-ADK). To investigate the physical origins of the deviation, we systematically studied the anisotropy of hydrogen molecules in intense laser fields for three wavelengths, 400 nm (multiphoton ionization), 1850 nm (tunneling ionization), and 800 nm (in between), by solving the time-dependent Schroedinger equation with a model potential. The calculated ratio of the ionization probabilities for laser fields parallel and perpendicular to the molecular axis are in reasonable agreement with experiment. Furthermore, by analyzing the molecular wave function and the model potential, we found that the discrepancies between experiment and the MO-ADK prediction originated from the inaccurate coefficients used in the model and that the assumption of isotropy of the effective potential in the tunneling region is invalid.

• OSTI ID: 21550132
• Journal Information: Physical Review. A, Vol. 83, Issue 6; Other Information: DOI: 10.1103/PhysRevA.83.063409; (c) 2011 American Institute of Physics; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ALIGNMENT
ANISOTROPY
HYDROGEN
ISOTROPY
LASER RADIATION
LASERS
MOLECULES
PHOTOIONIZATION
POTENTIALS
PROBABILITY
SCHROEDINGER EQUATION
TIME DEPENDENCE
TUNNEL EFFECT
WAVE FUNCTIONS
WAVELENGTHS
DIFFERENTIAL EQUATIONS
ELECTROMAGNETIC RADIATION
ELEMENTS
EQUATIONS
FUNCTIONS
IONIZATION
NONMETALS
PARTIAL DIFFERENTIAL EQUATIONS
RADIATIONS
WAVE EQUATIONS