LASER SPECTROSCOPY OF THE (010)(2)SIGMA(-)-(000)(2)SIGMA+ PARALLEL BANDS IN THE AOVER-TILDE2-PI-XOVER-TILDE2-SIGMA+ SYSTEM OF CAOH(), (2)SIGMA()

The forbidden A(010)2SIGMA(+), 2SIGMA(-)-X(000)2SIGMA+ paraLlel bands of CaOH, which gain transition strength through vibronic mixing betwee n different electronic states, have been observed via laser-induced fl uorescence. The fundamental bending frequency nu2 the Renner-Teller pa rameter epsilonomega2 in the A2PI state are determined as 361.346(1) a nd -36.4040(7) cm-1, respectively. The first excited bending vibration al level (010) of the X2SIGMA+ state has been observed via resolved LI F. The fundamental frequency nu2 and the 1-type doubling constant q(up silon) are determined as 352.898(6) and -7.086(87) x 10(-4) cm-1, resp ectively. (C) 1994 Academic Press, Inc.