S. Li et al., INFRARED-SPECTRA OF VAPORIZED PT AND PT-2 IN RARE-GAS MATRICES - UNIQUE PHONON EFFECTS(H), The Journal of chemical physics, 106(7), 1997, pp. 2583-2588
Laser-vaporized platinum metal, trapped in solid Ne, Ar, Kr, Xe (and A
r, Kr mixture) produced a progression of absorption bands with a spaci
ng of similar to 200 cm(-1) beginning at 1942 cm(-1) in Ne and shiftin
g successively to 1579 cm(-1) in Xe. In contrast with the specimen in
Ne, strong patterns of similar sidebands appeared in the spectra in th
e heavier matrices. This matrix effect is considered in some detail in
attempting to assign the trapped molecule and to explain the source a
nd structure of the sidebands. The conclusion is that the absorption s
pectrum is the previously unobserved (3) Pi(u)(1(u))<--X (3) Sigma(g)(
-)(0(g)(+)) transition of Pt-2 (inferred from Balasubramanian's calcul
ation) but with unique phonon interactions in the heavier matrices. Wh
en hydrogen was present in the matrix gases, Pt hydride bands were obs
erved but not prominently, in contrast to Ni+H-2 matrices. (C) 1997 Am
erican Institute of Physics.