Electron-impact excitation of molecular hydrogen

Abstract

We report the electron impact integrated and differential cross sections for excitation to the b

Low-energy electron scattering from molecular hydrogen: Excitation of the X1Σg+ to bZawadzki1, Wright2, Dolmat3 et al. 2018Phys. Rev. A

“…Similar to the experimental electron-H 2 data set, only fragmentary theoretical electron-impact cross section data were available, often with unqualified uncertainties and large discrepancies between various theoretical models and with experiment. This changed with the extension of the convergent close-coupling (CCC) method to electron collisions with molecules [13,14,15], and production of the first comprehensive theoretical data set of accurate e --H 2 cross sections [16,17,18]. A distinctive feature of the CCC cross section data set was an explicit demonstration of convergence and an estimate of an accuracy of better than 16% for most transitions.…”

Time-of-flight electron scattering from molecular hydrogen: Benchmark cross sections for excitation of the X1Σg+→b3Σ<

“…Comparison of the electron impact excitation of H 2 DCS from the molecular CCC of Zammit et al [16] with experimental data from the CSUF group for excitation of the…”

“…This large disagreement for such a fundamental cross section is certainly extremely worrisome and requires careful analysis of both theoretical and experimental techniques. The CCC method [16], for molecules, utilizes large close-coupling expansions to describe e --H 2 collisions. The set of H 2 target states used in such expansions is obtained via diagonalization of the H 2 Hamiltonian in a Sturmian (Laguerre) basis that allows it to model all important reaction channels including ionization.…”

“…The set of H 2 target states used in such expansions is obtained via diagonalization of the H 2 Hamiltonian in a Sturmian (Laguerre) basis that allows it to model all important reaction channels including ionization. Zammit et al [16] has used the fixed-nuclei (FN) formulation of the CCC method and demonstrated the convergence of the calculated cross sections with respect to the increasing size of the close-coupling expansion. Scarlett et al [13] has applied the adiabatic nuclei (AN) formulation of the CCC method to the X 1…”

Kinetic-energy release of fragments from electron-impact dissociation of the molecular hydrogen ion and its isotopologues

“…The T -matrix elements are solved for a sufficient number of partial waves to achieve convergence with the use of an analytic Born subtraction technique [28,34]. Cross sections for the dissociative ionization (DI) process (1) are calculated by summing over all positive energy states:…”