ROTATIONAL ANALYSIS OF THE HE-I PHOTOELECTRON-SPECTRUM OF HF

Combined theoretical and experimental studies of HeI photoelectron spe ctra for photoionization of the X1SIGMA+(v'' = 0) ground state HF lead ing to the X2PI(v+ = 0-2) and A2SIGMA+ (v+ = 0-3) ionic states, includ ing detailed analyses of the rotational bandshapes, are reported. Agre ement between the measured bandshapes and the calculated spectra, conv oluted with the experimental resolution function (22 meV FWHM), is exc ellent. Ionization potentials of 16.046(1) eV and 19.116(2) eV are obt ained for formation of the X and A ionic states, respectively. The vib rational spacings, deduced from the measured data by careful bandshape analysis, are in very good agreement with spectroscopic values.