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Infrared multiphoton dissociation of SF/sub 6/ at long wavelengths

Journal Article · · J. Chem. Phys.; (United States)
OSTI ID:6590052
; ; ;
The dissociation probability P/sub d/ of /sup 32/ SF/sub 6/ was investigated between 908 and 875 cm/sup -1/ at room temperature and at 140 K. In the region of the expected P/sub d/ maximum of /sup 36/SF/sub 6/ (approx. =905 cm/sup -1/), we found a ten times higher P/sub d/(32) (implying a ten times smaller selectivity for /sup 36/S) than expected from extrapolation of shorter wavelength data. The P/sub d/ spectrum in this and in other regions point to an important role of direct multiphoton transitions to levels containing quanta of the neighboring combination mode ..nu../sub 5/+..nu../sub 6/ (870 cm/sup -1/) besides ..nu../sub 3/ quanta. On the short wavelength side of ..nu../sub 3/, the analogous transitions involve the ..nu../sub 2/+..nu../sub 6/ mode (991 cm/sup -1/). The wings, and thus the spectral shape of P/sub d/, in the ..nu../sub 3/ region are also governed by them. They depend more strongly on temperature than stepwise transitions, because the intermediate near-resonances favor the high rotational states.
Research Organization:
Max-Planck-Institut f uer Quantenoptik 8046 Garching, Germany
OSTI ID:
6590052
Journal Information:
J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 90:6; ISSN JCPSA
Country of Publication:
United States
Language:
English

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400202* -- Isotope Effects
Isotope Exchange
& Isotope Separation
CHEMICAL REACTIONS
DECOMPOSITION
DISSOCIATION
ELECTROMAGNETIC RADIATION
EVEN-EVEN NUCLEI
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
INFRARED RADIATION
ISOTOPE SEPARATION
ISOTOPES
LASER ISOTOPE SEPARATION
LIGHT NUCLEI
LOW TEMPERATURE
MEDIUM TEMPERATURE
MULTI-PHOTON PROCESSES
NUCLEI
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RADIATIONS
SEPARATION PROCESSES
STABLE ISOTOPES
SULFUR 32
SULFUR COMPOUNDS
SULFUR FLUORIDES
SULFUR ISOTOPES