Spectroscopic mapping of the OH-Ar van der Waals potential
Fluorescence excitation spectra of OH-Ar van der Waals (vdW) complexes are observed in the spectral region about the OH A/sup 2/..sigma../sup +/(..nu..'=0)-X/sup 2/II/sub 3/2/(..nu..'=0) transition. A vibrational progression, consisting of seven elements with similar rotational structure, is assigned to an OH-Ar vdW stretching mode in the excited state. The last member of the progression a lower limit for the OH-Ar binding energy D/sub 0/(..nu..'=0) of 521 cm/sup /minus/1/. An estimate for the ground-state binding energy D/sub 0/(..nu..'=0) of greater than or equal to 24 cm/sup /minus/1/ is obtained from the spectral shift of the vdW vibrational feature to free OH. A comparison is made with an analogous low-frequency vibrational mode previously reported upon electronic excitation of OH in an Ar matrix.
- Research Organization:
- Univ. of Pennsylvania, Philadelphia (USA)
- OSTI ID:
- 5994169
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 92:20; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
ARGON
BINDING ENERGY
DATA
ELEMENTS
EMISSION SPECTROSCOPY
ENERGY
EXPERIMENTAL DATA
FLUIDS
FLUORESCENCE SPECTROSCOPY
GASES
HYDROXYL RADICALS
INFORMATION
INTERMOLECULAR FORCES
NONMETALS
NUMERICAL DATA
POTENTIALS
RADICALS
RARE GASES
SPECTROSCOPY
VAN DER WAALS FORCES