Quasibound levels and shape resonances of /sup 39/K/sub 2/(B /sup 1/Pi/sub u/) crossed laser-molecular beam studies and analytical interpretation
Quasibound levels and shape resonances in the (B /sup 1/Pi/sub u/ -X /sup 1/..sigma../sup +//sub g/) band system of /sup 39/K/sub 2/ have been recorded by crossed laser-molecular beam techniques. Using optical--optical double resonance, individual rovibrational levels (v'' = 15--18, J'' = 3--25) of the K/sub 2/ state are prepared by Franck--Condon pumping (FCP) in a supersonic nozzle beam. Excitation into quasibound levels below and above the (B /sup 1/Pi/sub u/) state barrier is detected as molecular and atomic (K4 /sup 2/P/sub 3//sub ///sub 2/..-->..4 /sup 2/S/sub 1//sub ///sub 2/ only) fluorescence. The resonance transition frequencies and shapes are measured and the results are used (a) to determine the scattering resonance energies, widths, and lifetimes; (b) to compare them with values obtained by a ''maximum internal amplitude'' approach (R. J. LeRoy and R. B. Bernstein, J. Chem. Phys. 54, 5114 (1971)); and (c) to check the agreement with exact calculations of the B state potential using the ''inverted perturbation approach (IPA).'' The bound and quasibound part of the B /sup 1/Pi/sub u/ state including the locus (R = 8.08 +- 0.05 A) of the barrier maximum (298 +- 8 cm/sup -1/ above the adiabatic dissociation limit) is found in excellent agreement with previous results. The shape resonances are not highly sensitive to the long-range interatomic forces, here the repulsive dipole--dipole resonance interaction.
- Research Organization:
- Fakultaet fuer Physik, Universitaet Bielefeld, D-4800 Bielefeld 1, Federal Republic of Germany
- OSTI ID:
- 6854761
- Journal Information:
- J. Chem. Phys.; (United States), Vol. 89:6
- Country of Publication:
- United States
- Language:
- English
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640301* - Atomic
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