15min:

JAMIE GENGLER, TIMOTHY STEIMLE AND JINHAI CHEN, Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ 85287.

The high-resolution laser induced fluorescence spectrum of a molecular beam sample of calcium monohydride, CaH, in the region of the strongly overlapped (1,0) A² -X^{2 +} and (0,0) B^{2 +}-X^{2 +} band systems near 630 nm and the (0,0) A² -X^{2 +} band system near 690 nm have been recorded and analyzed. The spectral features exhibit a small splitting which is attributed to proton magnetic hyperfine interactions in the X^{2 +} (v=0) state'.The energy levels of the A² (v=0) and X^{2 +} (v=0) vibronic states were modeled using a traditional effective Hamiltonian approach, where as those for the interacting A² (v=1)/B^{2 +} (v=0) vibronic levels were modeled by augmenting the traditional effective Hamiltonian with terms to account for local perturbations. A comparison to the analysis of the high temperature spectra performed by Martin, which did not include many of the spectral features of the present work, will be given.