Selective excitation, relaxation, and energy channeling in molecular systems. Progress report, December 1, 1980-November 30, 1981

Technical Report · Thu Jan 01 04:00:00 EST 1981

OSTI ID:6337214

Rhodes, W C

This research deals with the selective excitation, relaxation, and energy-channeling processes in molecular systems. The most significant results during the past year are as follows: (1) the role of the intensity of laser coupling with a molecule on the dynamics and selectivity of nonradiative processes has been studied theoretically and quantitatively in terms of computer simulations for some simple multistate models. This complements existing results which emphasize frequency selectivity of photochemical and photophysical processes; (2) the stochastic effects of the molecular medium (bath) have been formulated in terms of molecular energy surfaces for the molecule-bath modes and the associated sudden potential. This leads to a better understanding of the microscopic quantum bases for stochastic modulation effects on resonance emission of light; and (3) two distinct kinds of molecular resonances (termed dissipative and stochastic) have been formulated in terms of prototype coupling schemes for a molecule and the modes to which it is coupled. The resulting theory has led to new perspectives of the role of background interactions of a molecule with its medium on the kinetics and dynamics of molecular processes. Specifically, (a) a coupling strength ordering rule has been developed which explains the propensity for kinetic slowing effects due to background interactions; and (b) the tendency for stochastic modulation to induce sequential and parallel resonances has been discovered.

• Research Organization: Florida State Univ., Tallahassee (USA)
• DOE Contract Number: AS05-78OR05784
• OSTI ID: 6337214
• Report Number(s): DOE/OR/05784-1; ON: DE81028658
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
CHEMICAL REACTIONS
COLLISIONS
COMPUTERIZED SIMULATION
ELECTROMAGNETIC RADIATION
ENERGY-LEVEL TRANSITIONS
EXCITATION
LASER RADIATION
MECHANICS
MOLECULAR STRUCTURE
MOLECULE COLLISIONS
PHOTOCHEMICAL REACTIONS
PHOTON COLLISIONS
PHOTON-MOLECULE COLLISIONS
QUANTUM MECHANICS
RADIATIONS
RELAXATION
SIMULATION
STOCHASTIC PROCESSES