The sulfur Kβ emission and K-absorption spectra from gaseous H2S. III

Abstract

The sulfur Kβ emission in fluorescence and K absorption from gaseous H₂S were measured on a double crystal spectrometer. The sulfur Kβ spectrum consists of four peaks. The three strongest peaks are shown to be single vacancy transitions of electrons from the three outer MO’s to fill the single K shell vacancy. The weak fourth peak on the high energy side of the three line structure is identified as a double vacancy transition. The sulfur K−absorption spectrum consists of three peaks of decreasing intensity with increasing photon energy. The unusual breadth (FWHM of 1.50 eV) and asymmetry on the high energy side of the first peak is ascribed to the Frank−Condon factors of the transitions to the unoccupied antibonding MO’s 3b₂ and 6a₁. The other two peaks, which are narrow, are identified as transitions to Rydberg levels. In addition, the binding energy of the sulfur K shell electron was estimated to be 2478.3 eV. The sulfur L_2,3 absorption of H₂S is also discussed briefly.