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Theoretical study of the dissociation process by multiphoton absorption in the diatomic molecule
Author(s) -
Sugimori Kimikazu,
Ito Tomoya,
Takata Yusuke,
Ichitani Kazuhiro,
Nagao Hidemi,
Nishikawa Kiyoshi
Publication year - 2006
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/qua.21149
Subject(s) - diatomic molecule , wave packet , dissociation (chemistry) , chemistry , atomic physics , absorption spectroscopy , molecule , molecular physics , physics , quantum mechanics
We investigate multiphoton absorption, including the dissociation process in the OH molecule by means of wavepacket dynamics. The time‐development scheme is the so‐called split‐operator method, which conserves the norm of the state vector. The resultant wavepacket involves the information of all discrete vibrational states and the dissociative continuum state substantially, so we are able to treat all the bound–bound, the bound–continuum and the continuum–continuum transitions. The energy spectra of the system under the strong laser pulse can also be obtained by the spectrum method, where the autocorrelation function of the wavepacket under consideration is Fourier transformed. First, we discuss the field intensity dependence of the population and the competition between dissociation and absorption processes in multiphoton processes of above‐threshold dissociation (ATD). Then, we analyze the above‐threshold dissociation due to the continuum–continuum transition in detail. © 2006 Wiley Periodicals, Inc. Int J Quantum Chem, 2006