title: The (4,0) mode of HF dimer at 14,700 cm(-l).
abstract: The deltaK = 0 and 1 subbands of the (4,0) <-- (0,0) transition of (HF)2, near 14,700 cm(-1), have been measured by molecular-beam intracavity laser-induced fluorescence. The hydrogen interchange tunneling is basically quenched in (4, 0) for both K = 0 and 1 levels, consistent with the early suggestion from a phenomenological model [H.-C. Chang and W. Klemperer, J. Chem. Phys. 104, 7830 (1996)]. The band origin upsilon0 = 14,700.458(7) cm(-1) and rotational constant (B + C)/2 = 0.22278(31) cm(-1) are determined for K = 0 of the (4, 0) mode. From the observed deltaK = 1 <-- 0 spectrum, we determined that A = 24.3 cm(-1), (B + C)/2 = 0.22296(20) cm(-1), and (B-C) = 4.5(2) x 10(-3) cm(-1). The predissociation linewidths of both K = 0 and 1 levels are 470(30) MHz with no apparent rotational dependence.
authors.affiliation: Department of Chemistry and Chemical Biology Harvard University, Cambridge, Massachusetts 02138, USA.
authors.forename: Zhenhong
authors.initials: Z
authors.lastname: Yu
authors.forename: Essam
authors.initials: E
authors.lastname: Hammam
authors.forename: William
authors.initials: W
authors.lastname: Klemperer
mesh_terms: D019281:Dimerization; D004563:Electrochemistry / Q000379:methods*; D005453:Fluorescence; D006858:Hydrofluoric Acid / Q000737:chemistry*; D007834:Lasers; D011522:Protons
chemical_list: D011522:Protons; D006858:Hydrofluoric Acid