Tunable far infrared laser spectroscopy of van der Waals bonds: The intermolecular stretching vibration and effective radial potentials for Ar--H sub 2 O

Journal Article · Mon Jan 01 00:00:00 EST 1990 · Journal of Chemical Physics; (USA)

DOI:https://doi.org/10.1063/1.458459· OSTI ID:6985582

Cohen, R C; Busarow, K L; Lee, Y T; Saykally, R J ^[1]

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1. Department of Chemistry and Materials and Chemicals Sciences Division, University of California and Lawrence Berkeley Laboratory, Berkeley, California 94720 (US)

Measurements of the fundamental van der Waals stretching vibration {Sigma}(0{sub 00},{ital v}{sub {ital s}}=1) {l arrow}{Sigma}(0{sub 00},{ital v}{sub {ital s}}=0) of Ar--H{sub 2}O ({nu}{sub 0}=907 322.08(94) MHz) and a transition from the lowest excited internal rotor state {Sigma}(1{sub 01},{ital v}{sub {ital s}}=0) to the {Sigma}(1{sub 01},{ital v}{sub {ital s}}=1) level ({nu}{sub 0}=1019 239.4(1.0) MHz) are presented. A simultaneous rotational analysis of the new stretching data with the internal rotor bands observed by us previously (J. Chem. Phys. {bold 89}, 4494 (1988)), including the effects of Coriolis interactions, provides experimental evidence for the new assignment of the internal rotor transitions suggested by Hutson in the accompanying paper. Fits to the rotational term values for the {ital v}{sub {ital s}}=0 states are used to derive effective radial potential energy surfaces for each of the {Sigma} internal rotor states. The results show the well depth (153.4 cm{sup {minus}1}) of the effective radial potential for the {Sigma}(1{sub 01},{ital v}{sub {ital s}}=0) level to be approximately 25 cm{sup {minus}1} deeper than that for the {Sigma}(0{sub 00},{ital v}{sub {ital s}}=0) ground state of the complex, indicating that the former is stabilized considerably more by the anisotropic intermolecular potential energy surface than is the ground state.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6985582
• Journal Information: Journal of Chemical Physics; (USA), Vol. 92:1; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ARGON
CHEMICAL BONDS
ARGON COMPLEXES
INFRARED SPECTRA
WATER
ADDUCTS
CORIOLIS FORCE
POTENTIALS
VAN DER WAALS FORCES
VIBRATIONAL STATES
COMPLEXES
ELEMENTS
ENERGY LEVELS
EXCITED STATES
FLUIDS
GASES
HYDROGEN COMPOUNDS
NONMETALS
OXYGEN COMPOUNDS
RARE GASES
SPECTRA
400201* - Chemical & Physicochemical Properties