Cross sections for elastic and inelastic electron scattering from carbon disulfide

Abstract

Electron energy-loss spectra, measured as a function of the scattering angle, have been obtained for a carbon disulfide molecule, CS2, in the excitation energy range from 0 to 45 eV. The incident electron energy was 1000 eV. The absolute generalized oscillator strength (GOS) and absolute inelastic differential cross section have been determined as a function of the square of the momentum transfer (K2) for the intense allowed transition 1Σ+u ← 1Σ+g, centred at 6.3 eV. The absolute elastic differential cross section was also determined spanning an angular range from 1.5° to 10°. It is well known that at high incident energies and small scattering angles electrons behave like pseudo photons. The CS2 photoabsorption spectrum was consequently obtained by extrapolation from the measured small angle electron energy-loss spectrum. The result shows a good resemblance to the atmospheric spectrum of Jupiter, following comet impact.

VUV fluorescence following electron-impact dissociative excitation of CS2

“…ditional complexity when interpreting the resultant data. Boechat-Roberty et al [36] have studied elastic and inelastic electron scattering from CS 2 with particular emphasis on the 6.3-eV transition. Electron-impact ionization of CS 2 has been studied experimentally most recently by Lindsay et al [37] and Hudson et al [38], who have discussed and referenced earlier experimental and theoretical work.…”

Electronic State Spectroscopy of Halothane As Studied by ab Initio Calculations, Vacuum Ultraviolet Synchrotron Radiation, and Electron Scattering Methods

“…The halothane spectrum is converted into relative differential generalized strength and then extrapolated to the optical limit using the universal formula of Msezane and Sakmar . This extrapolation procedure has been discussed in detail elsewhere . The procedure to obtain absolute cross section values has also been described previously in some detail. , Briefly, the absolute values for the differential oscillator strength spectrum are obtained by applying the S (−2) sum rule: , S (−2) = ∫ R ( E / E H ) −2 (d f /d E ) d E = α where E H is the Hartree energy constant (27.21 eV) and α is the halothane static electric-dipole polarizability, α = 9.37 Å 3 .…”

“…28 This extrapolation procedure has been discussed in detail elsewhere. 29 The procedure to obtain absolute cross section values has also been described previously in some detail. 30,31 Briefly, the absolute values for the differential oscillator strength spectrum are obtained by applying the S(−2) sum rule: 25,32 S(−2) = ∫ R(E/E H ) −2 (df/dE) dE = α where E H is the Hartree energy constant (27.21 eV) and α is the halothane static electric-dipole polarizability, α = 9.37 Å 3 .…”

An x-ray absorption and a normal Auger study of the fine structure in the S2p−1region of the CS2molecule

“…For consideration of transitions to unoccupied levels, the ground-state electron configuration is useful including the lowest unoccupied valence levels. We shall use the following notations adopted previously, e.g., in [1,6]:…”