We report both measured and calculated rotationally resolved threshold
photoelectron spectra for single-photon coherent VUV ionization of th
e X 1A1 ground state of jet-cooled H2O and H2S. Agreement between the
calculated and measured spectra is very encouraging. Both the H2O and
H2S Spectra show type a transitions which arise from odd angular momen
tum components of the photoelectron matrix element and are quite molec
ular in origin. These type a transitions, however, are much weaker in
H2S due to its more atomiclike character.