CHARACTERIZATION OF SPIN-ORBIT AUTOIONIZING RYDBERG STATES EXCITED VIA ONE-PHOTON ABSORPTION FROM THE F-1-DELTA(2), RYDBERG STATE OF HBR

摘要

Rotationally and parity resolved excitation spectra of autoionizing Rydberg states of HBr in the energy region between the (2) Pi(3/2) and (2) Pi(1/2) ionic thresholds have been obtained in a double resonant excitation scheme via single rotational levels of the vibrationless F (1) Delta(2) Rydberg state. A cursory examination of these spectra reveals the presence of s, p, d, and f Rydberg series. Apart from the f series, which show almost Hund's case (e) coupling, these series clearly exhibit an angular momentum coupling scheme intermediate between Hund's case (c) and (e). As a result it is difficult to assign them as converging upon specific ionic rotational thresholds. A detailed analysis of the excitation spectra has consequently been performed employing multichannel quantum defect theory calculations, allowing for a determination of the quantum defects of the Hund's case (a) basis states and the relevant transition moments, and, concurrently, the assignment of nearly all the observed autoionizing resonances. (C) 1996 American Institute of Physics. [References: 22]