Abstract
Analytical results have been obtained for some aspects of polyatomic molecular interaction with resonant ir laser radiation. The following effects are investigated by use of Schrödinger's equation solution for natural multilevel models: the role of dynamic Stark effect in the transient region from molecular low levels to the quasi-continuum of highly excited vibrational levels; broadening of multiphoton transitions because of relatively fast decay into the quasi-continuum; threshold excitation property of multilevel systems with random detunings. Possible applications to constructing models for numerical calculations dealing with the molecule excitation problem are discussed.
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