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Examines a modified form of Shepard interpolation of ab initio molecular potential energy surfaces. Improvements in accuracy over previous related schemes; Taylor expansion used in the interpolation formula; Parameters determining the confidence volume.

Examines the ab initio potential energy surface for the quartet electronic state of NH[sup +][sub 3] from the collision reaction of N([sup 4]S) and H[sup +][sub 3]. Detailed exploration of the ab initio potential energy surfaces; Analysis on the reaction paths and simulation of reactions; Investigation on the possibility of surface crossing.

Examines the adiabatic potential energy surfaces (PES) for the ground and excited states of triplet methyl cation. Integration of molecular potential energy surfaces with multi-configurational self-consistent field methods; Investigation on the accuracy of PES; Properties of the reaction products.

Describes the development of a fast scan submillimeter spectroscopic technique which uses a voltage tunable backward wave oscillator (BWO) as a primary source of radiation. Basic spectroscopic system; Key system elements; System attributes; Tube characteristics; Frequency calibration scheme; Power supply scheme; BWO frequency-voltage characteristic.

Interpolated ab initio potential energy surfaces which describe abstraction and exchange reactions in collisions of hydrogen and water are reported. The electronic structure calculations are performed at the QCISD(T) level of theory, with an additivity approximation. A sufficiently large basis set is required to describe the Rydberg character of the electronic state for molecular configurations which are important for the exchange process. Classical and quantum dynamics calculations on the surfaces are presented. © 2000 American Institute of Physics. [ABSTRACT FROM AUTHOR]