화학공학소재연구정보센터
Journal of Chemical Physics, Vol.100, No.11, 8047-8054, 1994
Rotationally Resolved Nonresonant 2-Photon Ionization of SH
The threshold photoelectron (PE) spectrum for nascent SH formed in the ultraviolet photodissociation of H2S has been measured using the nonresonant two-photon pulsed field ionization (N2P-PFI) technique. The rotationally resolved N2P-PFI-PE spectrum of SH indicates that photoionization dynamics favor the rotational angular momentum change Delta N less than or equal to 0 with the Delta N, values up to -3, an observation similar to that found in the PFI-PE spectra of OH (OD) and NO. The ionization energy for SH(X (II3/2)-I-2) is determined to be 84 057.5 +/- 3 cm(-1) (10.4219 +/- 0.0004 eV). The spin-orbit splitting for SH(X 2II(3/2,1/2)) is 377 +/- 2 cm(-1), in agreement with the literature value. This study illustrates that the PFI-PE detection method can be a sensitive probe for the nascent internal energy distribution of photoproducts.