#### Title

Molecular physics of elementary processes relevant to hypersonics: Electron-molecule collisions

#### Document Type

Article

#### Abstract

Non-resonant, electron-impact, vibro-electronic excitation cross sections, involving vibrationally excited N2 molecules, to the mixed valence-Rydberg b,c,o 1Πu and b′,c′,e′ 1åu+ singlet states are presented. These cross sections are calculated using the so-called similarity approach, accounting for the vibronic coupling among excited states, and compared with the experiments and different theoretical calculations.

New cross sections for the electron-impact resonant vibrational excitation of CO2 molecule are calculated, for the symmetric stretching mode, as a function of the incident electron energy and for the transitions (υ i , 0,0)→(νf , 0,0) with νi = 0,1,2 and for some selected value of νf in the interval νi ≤νf ≤10. A resonance potential curve and associated widths are calculated using the R-matrix method. Rate coefficients, calculated by assuming a Maxwellian electron energy distribution function, are also presented for the same (νi , 0,0)→(νf , 0,0) transitions.

Electron-impact cross sections and rate coefficients for resonant vibrational excitations involving the diatomic species N2, NO, CO, O2 and H2, for multi-quantic and mono-quantic transitions, are reviewed along with the cross sections and rates for the process of the dissociative electron attachment to H2 molecule, involving a Rydberg excited resonant state of the H2- ion.

#### Disciplines

Atomic, Molecular and Optical Physics

#### Recommended Citation

Celiberto R, Laporta V, Laricchiuta A, Tennyson J, Wadehra JM. Molecular physics of elementary processes relevant to hypersonics: Electron-molecule collisions. The Open Plasma Physics Journal. 2014;7:33-47. doi: 10.2174/1876534301407010033