Low-energy electron impact excitation of the nitrogen molecule: optically forbidden transitions

Abstract

Ab initio calculations are performed on the e − -N 2 scattering system, at low impact energies, using the R-matrix technique. The X 1 + g ground state and the lowest seven valence excited states, A 3 + u , B 3 g , W 3 u , B 3 − u , a 1 − u , a 1 g and w 1 u , of N 2 are included in the close coupling expansion with each state being represented by a configuration interaction wavefunction in a hybrid orbital set. Various approximations for the representation of the correlation between the target and the incident electron are investigated. Integrated and differential scattering cross sections are presented, and compared to experiment, for excitation from the ground level to optically forbidden levels. The results compare favourably with recent experiments in this energy region and remove a number of problems with our previous work.

An Explanation for the Nitrous Oxide Layer Observed in the Mesopause Region

“…One reaction mechanism postulated by Zipf and Prasad (), based on their laboratory work, is that secondary electron impact from energetic electron precipitation (EEP) promotes N 2 to the excited triplet state. where the N 2 (A 3 Σ u + ) state lies 7.63 eV above the N 2 (X 1 Σ g + ) ground state (Gillan et al, ). In a similar manner, reaction can be induced by photoelectrons (energetic electrons produced by photo‐ionization of atmospheric species; Nagy & Banks, ).…”

Modeling of Plasma Reforming of Ethanol into Hydrogen in the Electric Discharge in a Gas Channel with Liquid Wall

“…) + e -(6.17 eV) 3.6x10 -10 [22] 4b N 2 + e - N 2 (B 3  g ) + e -(7.35 eV) 3.1x10 -10 [22] 5 N 2 + e - N 2 (a 1  g ) + e - ( 17 C 2 H 5 OH + e - C 2 H 5 + OH + e -(7.5 eV) 1.0x10 -9 [28] 18 C 2 H 5 OH + e - CH 3 CHOH + H + e -(7.5 eV) 1.0x10 -9 [28] 19 C 2 H 5 OH + e - C 2 H 5 OH + + 2e -(10.48 eV) 1.0x10 -12 [28] The nonisothermality of discharge plasma is characterized by two character temperatures: 1) average electronic temperature T e that is determined by the EEDF, i.e., by the applied electric field E/N, and 2) gas kinetic temperature T that is determined by conditions of convective cooling in the gas channel with liquid wall, i.e., by temperature of surrounding liquid (T  350K). In fact, the ratio ΣW i /ΣW ei in eq.…”

Pattern Resolution in X-ray Lithography Using Pattern Replication Technique on a Mask

“…The values derived from the data of Cartwright et al (1977) /Trajmar et al (1984) are in agreement with the present results within the rather large error limits while those of Brunger and Teubner (1990) are not. Gillan et al (1996) reported recently differential cross sections for excitation of the A 3 + u state from R-matrix calculations. The 90 • values obtained by them at 10 and 15 eV impact energies have been scaled to correspond to the ν = 6 and ν = 4, 5, 6 excitations by the Franck-Condon factors of 0.082 and 0.198, respectively, and are shown in figure 9(a) and (b).…”

“…(b) Same as (a) except for excitation of the combined vibrational levels ν = 4, 5, and 6. The theoretical results of Gillan et al (1996) are also indicated by open triangles.…”