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Measurement and analysis of the infrared-active stretching fundamental (. nu. /sub 3/) of UF/sub 6/

Journal Article · · J. Chem. Phys.; (United States)
OSTI ID:5548381
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High-resolution spectra of the infrared-active stretching fundamental ..nu../sub 3/ of /sup 238/UF/sub 6/ have been obtained between 620.6 and 633.5 cm/sup -1/ using tunable semiconductor diode lasers. Interference from hot bands was suppressed by cooling the UF/sub 6/ in a supersonic expansion, and useful monomer concentrations were produced with effective temperatures of <100 K. Portions of the band from P(77) to R(66) are illustrated. All transitions from the vibrational ground state have been assigned, and the Q branch has been fully analyzed. A total of 43 line frequencies and 110 frequency differences extending in J to P(77), Q(91), and R(67) has been used to fit seven spectroscopic constants. The ground- and excited-state values of the rotational constant B could be individually determined, and the U--F bond length in the ground vibrational state is r/sub 0/ = 1.9962 +- 0.0007 A. The Q branch of /sup 235/UF/sub 6/ has also been analyzed and the /sup 235/UF/sub 6/--/sup 238/UF/sub 6/ ..nu../sub 3/ isotope shift measured to be 0.603 79 +- 0.000 17 cm/sup -1/. The isotope shift and the Coriolis constant zeta/sub 3/ have been used to refine the general quadratic intramolecular force field of UF/sub 6/, and the Cartesian displacement coordinates of both infrared-active fundamentals are illustrated and compared with those of SF/sub 6/.

Research Organization:
University of California, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
OSTI ID:
5548381
Journal Information:
J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 83:1; ISSN JCPSA
Country of Publication:
United States
Language:
English

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Related Subjects

640302* -- Atomic
Molecular &amp; Chemical Physics-- Atomic &amp; Molecular Properties &amp; Theory
74 ATOMIC AND MOLECULAR PHYSICS
ACTINIDE COMPOUNDS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
BOND LENGTHS
CORIOLIS FORCE
DIMENSIONS
ENERGY LEVELS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
EXCITED STATES
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HEAVY NUCLEI
INFRARED SPECTRA
ISOMERIC TRANSITION ISOTOPES
ISOTOPE EFFECTS
ISOTOPES
LENGTH
MINUTES LIVING RADIOISOTOPES
MOLECULAR STRUCTURE
NUCLEI
RADIOISOTOPES
SPECTRA
SPECTRAL SHIFT
URANIUM 235
URANIUM 238
URANIUM COMPOUNDS
URANIUM FLUORIDES
URANIUM HEXAFLUORIDE
URANIUM ISOTOPES
VIBRATIONAL STATES
YEARS LIVING RADIOISOTOPES