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Reports on the use of converged close-coupling and coupled-states calculations to obtain state-to-state rate constants and pressure broadening coefficients for the collisional rotational (de)-excitation of acetylene by helium. Monitoring of the population decay in the prepared state and the transfer to other rotational states by laser induced fluorescence.

Studies the rotational and vibrational dynamics of argon-methane. Comparison between the experimental near infrared spectrum and the results of a theoretical calculation; Sensitivity of the spectrum to the anisotropy of the argon-methane potential surface; Agreement with the ab initio spectrum.

Discusses a theoretical calculation of the spectrum of the argon-methane complex based upon a previous ab initio potential energy surface. Proper rotation matrices used in the study; Body-fixed Hamiltonian describing the complex; Symmetry adaptation used in the study; Interaction of the complex with the laser; Bound states of AR-CH[sub 4].

Examines the total differential cross sections for the argon-methane scattering complex. Computation of the collision energy; Basis for the close-coupling calculations; Accuracy of the symmetry-adapted perturbation theory.

Calculates the intermolecular potential energy surface of the He-CO complex including the CO bond length dependence using symmetry-adapted perturbation theory. Potential minimum when the molecular bond length is fixed at an equilibrium value; Application of the potential in the calculation of bound state levels and the infrared spectrum for the complexes.

Studies the total differential cross sections and differential energy loss spectra for He-C[sub2]H[sub2] from an ab initio potential. Scattering obtained; Accuracy of the symmetry-adapted perturbation theory.

Applies the symmetry-adapted perturbation theory to compute the intermolecular potential energy surface of the argon-carbon-hydrogen complex. Dominance of first-order exchange contribution in the interaction energy; Ab initio potential having four equivalent minima for structures in which the argon atom approaches the face of tetrahedron.

A symmetry-adapted perturbation theory (SAPT) is formulated for interaction-induced electrical properties of weakly bound complexes. Asymptotic (large R) expressions are reported for the contributions to the collision-induced dipole moments and polarizabilities up to and including second order in the intermolecular potential. These long-range expressions require knowledge only of the multipole moments and (hyper)polarizabilities of the isolated monomers. Numerical results are given for the dipole moment of He-H2 and the polarizability of He2 and the accuracy of the SAPT approach is examined by comparison with full configuration interaction results. The role of various physical contributions to the dipole moment of He-H2 and the polarizability of He2 is investigated. The validity of the long-range approximation and the importance of charge penetration (damping) effects are discussed. [ABSTRACT FROM AUTHOR]