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dimer vibrational frequencywe= 197.2 cm-1 from matrix isolation emission |
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dimer force constant = 2.84 mdyne/Å from jet-cooled emission |
Huaiming Wang, Yifei Liu, Hanae Haouari, Robert Craig,
John R. Lombardi, and D.M.Lindsay
Department of Chemistry and Center for Analysis of Structures
and Interfaces (CASI),
The City College of New York (CCNY), New York, New York
10031
Received: March 31, 1997; In Final Form: July 2, 1997
J. Phys. Chem. A 1997,101, 7036-7038
Abstract
We report on an observation of the luminescence and luminescence excitation spectra of platinum dimer in an argon matrix. Samples were produced by sputtering from a metal target, followed by mass selection of dimer ions and codepositon with electrons and argon on a cold substrate. Emission is induced by pumping into the 810 - 815 nm region with a titanium-sapphire laser. Five sharp, intense spectral lines are observed, with an average spacing of 197.4 ± 3.3 cm-1 and origin at 10 730.5 ± 0.6 cm-1 . A much weaker vibrational progression in the emitting state gives we' = 179.2 ± 0.6 cm-1 . Fluorescence excitation profiles were also obtained and are well simulated using data from previous gas-phase measurements. A rather wide separation of the origins of excitation and emission indicates rapid intersystem crossing in the excited state, with the possibility that our emission is not to the dimer ground state.
Table: Observed luminescent lines of Pt2 in Ar Matrix Frequency(cm-1) Assignment 10,733.2 0-0 10,534.9 1-0 10,334.6 2-0 10,139.2 3-0 9,944.5 4-0
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