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  • 1
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    A semiclassical study of laser-induced atomic fluorescence from Na2, K2 and NaK (1982)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: A semiclassical treatment of laser-induced atomic fluorescence for the alkali-dimer systems Na2, K2 and NaK is presented. The variation of the fluorescence intensity with the frequency of the exciting laser photon is studied and a comparison of theoretical results with a set of experimental data is presented.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: AD-A127849 , AFOSR-TR-83-0358 , Molecular Physics; 47; 5, 19; 1982
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  • 2
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    A quantum-mechanical method for calculating level widths and shifts, applicable to type I unimolecular predissociation (1978)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Molecular Physics; 36; 6, 19; 1978
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  • 3
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    Theory of molecular rate processes in the presence of intense laser radiation (1979)
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    Publication Date: 2019-06-27
    Description: The present paper deals with the influence of intense laser radiation on gas-phase molecular rate processes. Representations of the radiation field, the particle system, and the interaction involving these two entities are discussed from a general rather than abstract point of view. The theoretical methods applied are outlined, and the formalism employed is illustrated by application to a variety of specific processes. Quantum mechanical and semiclassical treatments of representative atom-atom and atom-diatom collision processes in the presence of a field are examined, and examples of bound-continuum processes and heterogeneous catalysis are discussed within the framework of both quantum-mechanical and semiclassical theories.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
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  • 4
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    Laser-enhanced dynamics in molecular rate processes (1978)
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    Publication Date: 2019-07-13
    Description: The present discussion deals with some theoretical aspects associated with the description of molecular rate processes in the presence of intense laser radiation, where the radiation actually interacts with the molecular dynamics. Whereas for weak and even moderately intense radiation, the absorption and stimulated emission of photons by a molecular system can be described by perturbative methods, for intense radiation, perturbation theory is usually not adequate. Limiting the analysis to the gas phase, an attempt is made to describe nonperturbative approaches applicable to the description of such processes (in the presence of intense laser radiation) as electronic energy transfer in molecular (in particular atom-atom) collisions; collision-induced ionization and emission; and unimolecular dissociation.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Radiation energy conversion in space; Conference; Jan 26, 1978 - Jan 28, 1978; Moffett Field, CA
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  • 5
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    Semiclassical theory of unimolecular dissociation induced by a laser field (1978)
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    Publication Date: 2019-06-27
    Description: A semiclassical nonperturbative theory of direct photodissociation in a laser field is developed in which photon absorption and dissociation are treated in a unified fashion. This is achieved by visualizing nuclear dynamics as a representative particle moving on electronic-field surfaces. Methods are described for calculating dissociation rates and probabilities by Monte Carlo selection of initial conditions and integration of classical trajectories on these surfaces. This unified theory reduces to the golden rule expression in the weak-field and short-time limits, and predicts nonlinear behavior, i.e., breakdown of the golden rule expression in intense fields. Field strengths above which lowest-order perturbation theory fails to work have been estimated for some systems. Useful physical insights provided by the electronic-field representation have been illustrated. Intense field effects are discussed which are amenable to experimental observation. The semiclassical methods used here are also applicable to multiple-surface dynamics in fieldfree unimolecular and bimolecular reactions.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: AD-A056671 , AFOSR-78-1042TR , Journal of Chemical Physics; 68; Apr. 1
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