Electron collisions with CO: Elastic and vibrational excitation cross sections

Abstract

Absolute differential elastic and vibrational excitation cross sections up to v = 11 were measured for CO in scattering angle ranges extending to 180 • at energies between 0.2 and 5 eV (and an elastic measurement at 10 eV). The lowest angles were 0 • for inelastic scattering and between 5 • and 20 • for elastic scattering, depending on energy. Integral cross sections were derived by integrating under the angular distributions and compared with previous beam and swarm measurements. The sum of the integral cross sections agrees very well with the available transmission measurements of the grand total cross section, thus validating the present measurements. The present elastic differential and integral cross sections are in excellent agreement with the best available measurement [Gibson et al., J. Phys. B 29, 3197 (1996)], but the v = 1 inelastic cross section is about 25% higher. This could have consequences for simulations of cometary and planetary atmospheres.

Electron collisions with excited molecules in low temperature plasmas

“…The cross sections were found to be in good agreement with previous theoretical calculations [14] and with the experiments [15] as shown in Fig. 8.…”

Autodetachment Dynamics of Acrylonitrile Anion Revealed by Two-Dimensional Electron Impact Spectra

“…The measurements were performed using a spectrometer with hemispherical analyzers [29]. The energy scales are accurate to within ±10 meV, resolution was 16 meV in the energy-loss mode with 300 pA beam current.…”

Absolute angle-differential elastic cross sections for electron collisions with diacetylene

“…The measurements were performed using a spectrometer with hemispherical analyzers [12][13][14][15]. The energy resolution was about 15 meV in the energy-loss mode, at a beam current of around 200 pA.…”

“…The energy resolution was about 15 meV in the energy-loss mode, at a beam current of around 200 pA. The instrumental response function was determined on elastic scattering in helium and all spectra were corrected as described earlier [13,15]. Absolute values of the cross sections were determined by the relative flow technique as described by Nickel et al [16] using the calculated helium elastic cross sections of Nesbet [17] as a reference.…”

“…The curves were corrected for the instrumental response function and fitted to the absolute values measured at discrete angles of 20 • , 45 • , 90 • , 135 • , and 180 • , as described in Refs. [13,15]. The angle of the magnetic scan was incremented in steps of 2.5 • .…”