ABSTRACT
The electronic spectrum of gas-phase tellurium dioxide has been recorded between 345 and 406 nm using the technique of laser-induced fluorescence spectroscopy. The TeO(2) sample was prepared by direct heating of the solid and by seeding it in a continuous free-jet expansion in argon. Twenty-seven cold bands and thirty-two hot bands were assigned. The wavenumbers of the band origin and symmetric stretching and bending vibrational modes for the upper and lower states were determined in a simple least-squares fit: nu(0) = 25526 cm(-1), omega(1)(') = 679 cm(-1), omega(2)(') = 220 cm(-1), omega(1)(") = 823 cm(-1), omega(2)(") = 282 cm(-1). Copyright 2000 Academic Press.
ABSTRACT
The electronic spectrum of FeH in the regions of the 532 nm (green) and 630 nm (red) systems has been investigated using the techniques of dispersed and undispersed laser induced fluorescence. Sixteen lines have been assigned in the Omega = 1/2 <-- Omega = -1/2 subband of the e6Pi-c6Sigma+ transition and term values determined for the previously uncharacterized e6Pi1/2 spin-orbit component. A further fourteen lines were assigned to the connected Omega = 1/2 <-- Omega = 3/2 subband of the e6Pi-a6Delta transition and term values for the hitherto uncharacterized a6Delta3/2 component were determined. A study of the high-temperature spectrum of FeH, recorded previously by McCormack and O'Connor (1), enabled the branches of the Omega = 7/2 <-- Omega = 9/2 subband of the e6Pi-a6Delta transition to be extended to higher J values. These predictions were confirmed by laser induced fluorescence (LIF) experiments and led to the assignment of 13 additional lines in this subband. The term values for the e6Pi7/2 and a6Delta9/2 spin-orbit components were thus extended to higher J values. Copyright 1998 Academic Press.
