Z. Hu, Q. Zhou, S. Deosaran, J. R. Lombardi, and D. M. Lindsay,
in Physics and Chemistry of Finite Systems: From Clusters to Crystals,
ed. P.Jena, S.N. Khanna and B.K.Rao
(Kluwer Academic Publishers, 1992) p.969.
Abstract
We report absorption ("scattering depletion") spectra and
Raman measure- ments for Zr2 in an argon matrix prepared by
the mass selected ion deposition technique. The principal dimer absorption
bands occur at 388 nm and near 630 nm where we observe a vibrational progression
with wo'= 225 (15) cm-l for
To = 15,230 (15) cm-l. Resonance Raman spectra, obtained
by exciting into the 630 nm band, give we"
= 305.7 (35) cm-l and wece"
= 0.5 (7) cm-l. The Raman data are consistent with either a
1Sg+ or a 3Dg
ground state.
"Resonance
Raman Spectrum and Excitation Profile of Mass-selected Zirconium Trimers"
Hanae Haouari, Huaiming Wang, Robert Craig, John R. Lombardi,
and D.M. Lindsay,
J.Chem.Phys., 103, 9527 (1995).
Abstract
We present the resonance Raman and Raman excitation profile of mass-selected
zirconium trimers in argon matrices. In the Raman spectra, two fundamentals
and one overtone are observed. Average Raman shifts, along with standard
deviations (in parentheses) are 176.7 (1.3) cm-1 (n2)
, 258.0 (1.2) cm-1 (n1),
and 516.1 (0.8) cm-1 (2n1).
The ratio of the frequencies of the two lowest lines (n1/n2)
is 1.46, which is very close to the square root of 2. This is indicative
of a symmetrical equilateral geometry (D3h). In such a case
we expect two normal frequencies, one for a totally symmetric stretch of
symmetry a'1 (n1) and
a doubly degenerate bend of symmetry e' (n2).
The Raman excitation profiles of the n1 (a'1 ) line shows two
broad maxima, one near 491 nm and the other near 614 nm. The n2
(e') profile shows a broad region of intensity only near 614 nm. With the
aid of theory we assign the 614 nm band to be 1A'1
- 1E' (x,y polarized) while the 491 nm band must be 1A'1
-1A"2 (z polarized).
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