INFRARED DIODE LASER AND FOURIER TRANSFORM SPECTROSCOPY OF THE NO3 RADICAL

Author Institution:The band of $NO_{3}$ at $1492 cm^{-1}$ reported previously [J. Chem. Phys. 82, 2196 (1985)] has been reinvestigated by extending the observations so as to take ground-state combination differences. A slight revision of the assignment now removes all anomalies from the ground state. On the other hand, a small, but finite spin-orbit interaction term exists in the upper state. The first-order Coriolis coupling constant which was observed differs much from the calculated value. This and other anomalous features in the upper state are discussed in light of a few models including a dynamical $C_{2v}$ structure