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Relaxation Dynamics of Highly Excited Halogens in Their Electronic Ground States
Final rept. 1 Aug 1989-15 Oct 1991,
EMORY UNIV ATLANTA GA
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Highly excited vibrational levels of ground state iodine, and all levels of the metastable state, are involved in processes leading to the dissociation of I2 in the chemical oxygen iodine laser COIL. Populations in these vibrationally and vibronically excited levels can be sensitively monitored by exciting laser induced fluorescence LIF from the valance to ion-pair transitions. However, accurate spectroscopic constants are required for the extraction of population distributions from spectral intensity data. Constants for the systems were obtained from rotationally resolved spectra for jet cooled, metastable I2. Studies of matrix isolated I2 and IBr were undertaken in order to examine their electronic relaxation dynamics in simple cryogenic solids, and to determine the A and A state radiative decay rates. Large matrix shifts were observed, caused by solvation of the excited state dipole. It is probable that an optically pumped laser, operating on the D-A transition of Ar matrix isolated I2, could be constructed.
APPROVED FOR PUBLIC RELEASE