Rotational excitation, nonreactive

Fig. 1. Nonreactive rotational excitation cross sections (in ag) for H + H2(0,j) H + H2(0,j ) as a function of relative translational energy. The results in this figure are based on 1040, 386, 600, and 1000 trajectories at the four energies respectively.

In this volume, the first chapter focuses upon some chemical reactions discussed in sufficient detail so that the excited reaction products can be definitely identified. In the second chapter, some of the general rules are considered that govern the development of the potential-energy surfaces associated with the intermediate collision complex. The third chapter deals with the theoretical and experimental aspects of nonreactive interchange of energy among kinetic, rotational, and vibrational channels, while the fourth and fifth chapters focus upon some aspects of electronic energy transfer primarily between electronic and vibrational modes. Two short specialized chapters follow which deal with some of the important excited-state reactions in atmospheric and laser studies. 

The next stage of experimental control consists in forming the reactants in known electronic, vibrational, and rotational states either by selective ionization and excitation or by state selection. (Here, the neutral reactant must also be formed as a beam or else the state selection will be lost by collision.) Once again, total integral, integral reactive, and integral nonreactive cross sections may be measured, but the particular information... 

Balakrishnan, Forrey, and Dalgarno [28] investigated vibrational relaxation of H2 in collisions with H atoms for vibrational quantum numbers u = 1 to 12 of the H2 molecule. They adopted a nonreactive scattering formalism and neglected the rotational motion of the H2 molecule. The calculations showed that vibrational relaxation rate coefficients are strongly dependent on the initial vibrational level of the H2 molecule. The relaxation rate coefficients were found to increase by about seven orders of magnitude between vibrational levels v = 1 and v = 12. The dramatic variation in the rate coefficients with increase in vibrational excitation was explained in terms of the matrix elements of the interaction potential between... 

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