INVESTIGATION OF EXCITED VIBRATIONAL LEVELS IN THE X2-SIGMA+ STATE OF CAOH AND CAOD BY RESOLVED FLUORESCENCE SPECTROSCOPY

Excited vibrational levels in the X2-SIGMA+ state of CaOH and CaOD have been observed via dispersion of laser induced fluorescence from selectively populated rotational levels of the A2-pi (100) state. The rotational structure of the (100), (200),(300) and (020) levels has been analysed for both molecules; for CaOH, the (400) level was also observed. The X2-SIGMA+ (020) level is split into 2-DELTA (l = 2) and 2-SIGMA+ (l = 0) components with spacings of 24.369 and 17.183 cm-1 for CaOH and CaOD, respectively. Vibrational term values and rotational constants were determined for all the observed levels, and are based on an accuracy of better than 0.05cm-1 for the measured line positions of the resolved fluorescence.