Accession Number : ADD095141

Title :   Critically Evaluated Rate Constants for Gaseous Reactions of Several Electronically Excited Species,

Corporate Author : NATIONAL STANDARD REFERENCE DATA SYSTEM

Personal Author(s) : Schofield, Keith

Report Date : Jan 1979

Pagination or Media Count : 81

Abstract : As we derive the ability to look at the chemistry of various systems in much greater detail, the need for the inclusion of electronically excited state chemistry in kinetic models is increasingly being found necessary. Obvious examples concern atmospheric modeling of regions of normal or perturbed atmospheres and laser chemistry. However, their inclusion in any energetic non-equilibrated system also requires assessing. Whenever energy is deposited or released in a chemical system knowledge of its transfer and redistribution processes becomes important. The characterization of these relaxation mechanisms and the energy storage potential of metastable states has become a primary goal of gas phase kinetics. This broad interest in spin states and their influence on reaction path has fluorished very rapidly, partly as a result of technological developments in experimental methods but also to meet the greater level of sophistication in kinetic modeling of chemical systems. As a consequence, much new data are available that appear to offer a severe challenge to our theoretical understanding. It is very necessary to understand the relationships between electronic structure and reactivity for the low lying states of series of atoms and molecules and also to establish quantitatively the stability of the various states to radiative and collisional relaxation processes. Ultimately, a systematic examination and explanation of their behavior is required. The present study is an initial effort to facilitate such an ambition.

Descriptors :   *REACTION KINETICS, *VAPOR PHASES, *ELECTRONIC STATES, ACTIVATION ENERGY, EXCITATION, INTERACTIONS, ATOMS, MOLECULES, COLLISIONS, QUENCHING, RADIATION, LIFE EXPECTANCY(SERVICE LIFE), SPIN STATES, RELAXATION, MOLECULAR VIBRATION, MOLECULAR ROTATION, ENERGY LEVELS, REACTIVITIES, RATES, CONSTANTS

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE