Electron-impact rotational and hyperfine excitation of HCN, HNC, DCN and DNC

摘要: Rotational excitation of isotopologues HCN and HNC by thermal electron-impact is studied using the molecular R-matrix method combined with adiabatic-nuclei-rotation approximation. Rate coefficients are obtained for electron temperatures in range 5–6000 K transitions among all levels up to J= 8 . Hyperfine rates also derived infinite-order-sudden scaling method. It shown that dominant rotational dipole-allowed, is, those which ΔJ= 1 The hyperfine propensity rule ΔJ=ΔF found be stronger than case He–HCN collisions. For dipole-allowed transitions, exceed He atoms six orders magnitude. As a result, present should included any detailed population model sources where fraction larger 10−6, example, interstellar shocks comets.