High resolution spectroscopy of the OsO/sub 4/ stretching fundamental at 961 cm/sup -1/
The ..nu../sub 3/ bands of /sup 187/Os/sup 16/O/sub 4/, /sup 189/Os/sup 16/O/sub 4/, and /sup 192/Os/sup 16/O/sub 4/ have been recorded using both a Michelson interferometer (resolution 0.06 cm/sup -1/) and a tunable semiconductor diode laser (resolution limited by the Doppler width, approx.0.0007 cm/sup -1/). The rotational fine structure differs from that of most other spherical-top molecules, for only rotational levels of A symmetry exist. A total of 112 individual vibration--rotation lines in the P and R branches of the three isotopic species were calibrated against stimulated emission lines from a high-voltage CO/sub 2/ gain cell, and were used to determine three scalar and two tensor spectroscopic constants for each species; an additional scalar constant was obtained from an analysis of the Q branch of /sup 192/OsO/sub 4/. The strength of P (11) A/sub 2//sup ts0/ was measured for /sup 192/OsO/sub 4/ and yields a vibrational transition moment for ..nu../sub 3/ of 0.17 +- 0.02 D. Transitions of all isotopic species that are expected to fall near CO/sub 2/ laser lines in the region 949--972 cm/sup -1/ are tabulated as an aid in the interpreation of saturation spectroscopy experiments. The general quadratic symmetry and valence force constants of OsO/sub 4/ were redetermined, using the isotope shifts in ..nu../sub 3/ as the additional constraints for the F/sub 2/ symmetry block.
- Research Organization:
- University of California, Los Alamos Scientific Laboratory, Los Alamos, New Mexico 87545
- OSTI ID:
- 6667699
- Journal Information:
- J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 69:4; ISSN JCPSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
CHALCOGENIDES
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
INFRARED SPECTRA
MOLECULAR STRUCTURE
OSMIUM COMPOUNDS
OSMIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
RESOLUTION
ROTATIONAL STATES
SPECTRA
TRANSITION ELEMENT COMPOUNDS
VIBRATIONAL STATES