Knowledge Bank

Energy transfer between the CaCl $B2\Sigma +$ and $A2\Pi 1/2,3/2$ 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 $B2\Sigma +\leftarrow X2\Sigma +$ and then $E2\Sigma +\leftarrow B2\Sigma +$ will be considered.