TWO PHOTON EXCITATION SPECTRA AND ENERGY TRANSFER PROCESSES IN CaCl

$^{1}$ J. A. Coxon, D. A. Ramsay, and D. W. Setser, Can. J, Phys. 53, 1587 (1975).Author Institution: Quantum Institute, University of CaliforniaEnergy transfer between the CaCl $B^{2}\Sigma^{+}$ and $A^{2}\Pi_{1/2,3/2}$ states has been investigated using laser-induced fluorescence. The CaCl was produced either in a heat-pipe oven or in a fllowing metal vapor flame. In spite of the short measured radiative lifetimes (30-40 nsec), efficient electronic and vibrational energy transfer are observed at pressures of less than 1 Torr. Spectra obtained from chemiluminescence, laser-induced photoluminescence and white light photoluminescence indicate the power of comparison techniques in studying energy transfer processes. Comparison of the data between the metal-rich heat pipe measurements and metal-lean flames as a means of mechanism elucidation will be discussed. Photoexcitation and laser photoluminescence spectra obtained with a Rhodamine 6G cw tunable dye laser will be discussed. In particular, dye-laser double resonance experiments which pump first $B^{2}\Sigma^{+} \leftarrow X^{2}\Sigma^{+}$ and then $E^{2}\Sigma^{+} \leftarrow B^{2}\Sigma^{+}$ will be considered