Formation of NH(A3Π) by Electron-Impact Dissociation of Isothiocyanic Acid

Abstract

Abstract Emission spectra of the fragments of Isothiocyanic acid (HNCS) produced by electron impact were studied. The onset for formation of NH(A3Π) is 9.2±0.5 eV. On the basis of the excitation function of the NH(A–X) band, NH(A) is shown to be formed via a spinforbidden process HNCS→NH(A3Π)+CS(X3Σ+) near the onset. At higher energies, a spin-allowed process HNCS→NH(A)+CS(a3Π) seems to be predominant. The ratio of the formation rate of NH(c) to that of NH(A) is 0.18±0.03.