The nonresonant two-photon zero kinetic energy photoelectron spectrum from the electronic ground state of H2S

Abstract

The nonresonant two-photon (1 + 1) ZEKE (zero kinetic energy) photoelectron spectrum fromjhe X∼1A1 electronic ground state of H2S is reported. Complete rotational resolution of the X ∼2B1 ground state of the ion was achieved for different temperatures in the jet. The ZEKE spectra show angular momentum transfer up to ΔN=2. The rotational N+Ka+Kc+ ←J″Ka″Kc″ branching ratios for the low-lying rotational levels were determined. The strongest transitions are those with ΔKa=Ka+ - Ka″=±1 and ΔKc=Kc+-Kc″=0 (type c transitions) but transitions with ΔKa=0 and ΔK c=±1 (type a transitions) also show a surprisingly high intensity. Changes in Ka or Kc up to ±3 are observed. The two-photon spectra are compared with those obtained via one-photon VUV photoionization by other authors. © 1993 American Institute of Physics.