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Laser‐induced alignment dynamics in multiphoton dissociation of H 2 +
Author(s) -
Atabek O.
Publication year - 1997
Publication title -
international journal of quantum chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 105
eISSN - 1097-461X
pISSN - 0020-7608
DOI - 10.1002/(sici)1097-461x(1997)65:5<617::aid-qua27>3.0.co;2-y
Subject(s) - chemistry , excitation , dissociation (chemistry) , atomic physics , laser , kinetic energy , polarization (electrochemistry) , triatomic molecule , excited state , trapping , photodissociation , molecule , molecular physics , physics , optics , photochemistry , ecology , organic chemistry , quantum mechanics , biology
Angular‐resolved kinetic energy distributions of fragments resulting from dissociation induced by intense, short, linearly polarized laser pulses are calculated using an accurate three‐dimensional Fourier transform method in spherical coordinates. The rotational excitation of the molecule leads, in general, to an alignment of the photofragments with respect to the field polarization vector. But, unexpectedly, increasing the field strength may also produce fewer aligned fragments at the higher kinetic energies of the multiphoton above the threshold dissociation spectrum. H 2 + photodissociating by interaction with an Nd:YAG laser at λ=532 nm and for intensities of 10–50 TW/cm 2 is taken as an illustrative example, for which some angular‐resolved experimental spectra are available. A comprehensive interpretation is provided within the field‐dressed Floquet picture by referring to two strong‐field mechanisms, namely, the potential barrier lowering (also responsible for bond softening) and the nonadiabatic transitions (also responsible for the vibrational trapping). © 1997 John Wiley & Sons, Inc. Int J Quant Chem 65 : 617–624, 1997