Journal of Chemical Physics, Vol.101, No.2, 891-898, 1994
Pyrolysis Jet Spectroscopy and Ab-Initio Studies of the S-1 and T-1 States of Germanium Difluoride
Spectra of jet-cooled germanium difluoride were obtained by the reaction of germanium metal and fluorine in the throat of a heated supersonic jet. Two band systems at 331-305 and 231-224 nm were observed by laser-induced emission excitation spectroscopy. On the basis of high quality ab initio predictions of the energies, geometries and vibrational frequencies of the;lower electronic states, the two band systems are assigned as ($) over tilde a(3)B(1)-($) over tilde X(1)A(1) and ($) over tilde A(1)B(1) ($) over tilde X(1)A(1), respectively. The T-1-S-0 spectrum consists of a long, well-resolved progression in the excited state bending frequency with nu’(2) = 192.2 cm(-1) and T-00=30 582.1.cm(-1). The S-1-S-0 spectrum is a complex tangle of vibronic structure accompanied by a rising background. A partial analysis of the vibronic structure gave nu’(2) = 159.6 cm(-1) and T-00= 43 860.9 cm(-1). The spectra are very similar to the analogous band. systems of GeCl2.
Keywords:INDUCED FLUORESCENCE SPECTROSCOPY;RESOLVED ELECTRONIC-SPECTRUM;SINGLET-TRIPLET SEPARATION;GAUSSIAN-BASIS SETS;CONFIGURATION-INTERACTION;A1A"-X1A’ TRANSITION;NATURAL ORBITALS;WAVE-FUNCTIONS;ROW ATOMS;GEF2