Unitarized first-order many-body approximation for the electron impact excitation of triplet states of helium

Abstract

We use unitarized first-order many-body theorj (UFMB) to obtain differential cross sections for the electron impact excitation of the 2% and Z3P states of helium in the intermediate energy range. Our results are in mcch better agreement with experiment than previous calculations using lhe weak-coupl: __ ..,roach.

Multi‐channel coupling effects for electronic excitations leading to the b3∑, a3∑, and c3∏u states of H2

“…In this work, we perform such a systematic study using a simple friendly computational method, the unitarized distorted wave method (UDWM), initially proposed by Seaton 19, and recently applied by Silva and da Paixão 20 to study the electronic excitation of He. Specifically, the UDWM is applied to calculate differential cross section (DCS) and integral cross section (ICS) for electronic excitations leading to the b 3 ∑, a 3 ∑, c 3 ∏ u excited states of H 2 in the 15–60‐eV energy range.…”