Detection and spectroscopic studies of gas-phase hydroxyl-krypton by laser-induced fluorescence
摘要:
The van der Waals complex OH-Kr has been detected in a free jet expansion by laser-induced fluorescence (LIF) near the (1,0) band of the A2-SIGMA+ <-- X2-PI(i) transition of uncomplexed OH. The excitation spectrum reveals a progression of vibrational bands which have been assigned to the stretching motion of the complex. A Birge-Sponer plot of this progression yields a fundamental frequency of omega(e)' = 196 +/- 8 cm-1 and an anharmonicity constant of omega(e)'chi(c)' = 7.4 +/- 0.7 cm-1 for the A2-SIGMA+ excited state. The lower limit of the binding energy of thc complex is measured as D0'(nu'=1) greater-than-or-equal-to 1131 cm-1. These results are compared to those obtained from recent gas-phase LIF studies on the OH-Ne and OH-Ar complexes near the A2-SIGMA+ <-- X2-PI(i) (0,0) and (1,0) bands of OH, respectively, and those from a matrix LIF study on the OH-Kr complex near the (2,0) band of OH,