CALCULATIONS OF EINSTEIN-A COEFFICIENTS FOR TRANSITIONS BETWEEN VIBRATIONAL LEVELS IN NO(A 4-PI)

The dipole moment function calculated by Langhoff et al. [J. Mol. Spectrosc. 138, 123 (1989)] for NO(a 4PI) has been used in conjunction with an RKR potential to obtain the vibrational transition probabilities of this state, for levels v = 1-19. The probabilities increase with v, from 5 s-1 for v = 1 to a maximum of 34 s-1 for v = 13. Spectral intensities have been calculated for the situation that a 4PI molecules are created at the top of the potential, and cascade down without collisional quenching. Inclusion of a radiative loss in the a-X system results in the accentuation of overtone 1100-2000 cm-1 emission in the spectrum. These infrared bands may be significant in an N+O recombination environment, such as afterglows and airglow.