THE $\alpha (a^{4}\Pi-X^{2}\Pi)$ AND $\zeta (b^{4}\Sigma^{-}-X^{2}\Pi)$ INTERCOMBINATION BANDS OF NITRIC OXIDE

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Title: THE $\alpha (a^{4}\Pi-X^{2}\Pi)$ AND $\zeta (b^{4}\Sigma^{-}-X^{2}\Pi)$ INTERCOMBINATION BANDS OF NITRIC OXIDE
Creators: Copeland, Richard A.; Dyer, M. J.; Williamson, D. G.; Cosby, P. C.; Slanger, T. G.; Huestis, D. L.
Issue Date: 1995
Publisher: Ohio State University
Abstract: The $NO(a^{4}\Pi)$ state, in $\nu = 11, 12, 14$, and the $NO(b^{4}\Sigma^{-})$ state, in $\nu = 2,3$, have been laser-excited from the $X^{2}\Pi$ ground state and detected by time-delayed $B^{2}\Pi-X^{2}\Pi$ emission between 245 and 265 nm resulting from collisional transfer. Our previous $work^{1,2}$ represented the first optical excitation of intercombination bands in NO. The present investigation provides the first quantitative spectroscopic information about b(2) and a(11, 12, 14). The frequency-tripled dye laser output (200-210 nm) had a linewidth of $0.15 cm^{-1}$ and was calibrated against $I_{2}$ in the visible. In the $\alpha$-system we have observed 40 of the 48 expected rotational branches, with comparable intensity (the strongest being only five times the weakest). However, the intensities of the lambda doublet pairs differ by as much as a factor of two. Thus there appear to be many sources of borrowed intensity for this forbidden transition. Spectroscopic constants for a(11) and a(14) will be presented. b(2) and a(12) lie in the same energy region and appear to be strongly perturbing each other. a(10) and a(13) were not observable due to overlap with strong $\gamma$- and $\beta$-band features
Description: $^{1}$M.J. Dyer, et al., Chem. Phys. 171, 237 (1993) $^{2}$R.A. Copeland, et al., ""The $NO(a^{4}\Pi)$ state: Direct photoexcitation from the ground state,'' Chem. Phys. Lett. (in press).
Author Institution: SRI International, Menlo Park, CA 94025; California Polytechnic State University, San Luis Obispo, CA 93407
Other Identifiers: 1995-TF-04
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