Application of the close-coupling method to excitation of electronic states and dissociation ofH2by electron impact

Abstract

The close-coupling method has been applied to the electron-${\mathrm{H}}_2$ collision to obtain excitation cross sections of the $b{}_{}{}^3{}_{}{}^{}\Sigma _u^{+}{}_{}{}^{}$, $a{}_{}{}^3{}_{}{}^{}\Sigma _g^{+}{}_{}{}^{}$, $e{}_{}{}^3{}_{}{}^{}\Sigma _u^{+}{}_{}{}^{}$, $c{}_{}{}^3{}_{}{}^{}\Pi _u^{}{}_{}{}^{}$, and $B{}_{}{}^1{}_{}{}^{}\Sigma _u^{+}{}_{}{}^{}$ states. Cross sections of the triplet states are presented at several incident-electron energies between threshold and 40 eV, and those of the $B{}_{}{}^1{}_{}{}^{}\Sigma _u^{+}{}_{}{}^{}$ state at 25, 50, 75, and 100 eV. Vibrational levels are treated by the Franck-Condon-factor approximation, and the cross sections are rotationally averaged. Cross sections by the Born-type calculations are markedly different from those of the present calculation. Furthermore, the manner and degree to which they differ also vary from state to state. Comparison with experiment is limited to a set of experimental data of total dissociation cross sections.