Absolute Generalized Oscillator Strengths for Four Electronic Transitions in Carbon Monoxide

TLDR: In this article, the authors measured the generalized oscillator strength of the fourth positive bands of carbon monoxide by comparing inelastically and elastically scattered electrons at 300, 400, and 500 eV kinetic energy and using the elastic collision cross sections measured by Bromberg.

Abstract: Generalized oscillator strengths have been measured for the υ′ = 2 level of the fourth positive bands of carbon monoxide by comparing inelastically and elastically scattered electrons at 300‐, 400‐, and 500‐eV kinetic energy and using the elastic collision cross sections measured by Bromberg [J. Chem. Phys. 52, 1243 (1970)]. Extrapolation to zero momentum change gives f0 = 0.0429. From relative intensity measurements, the limiting oscillator strengths of the levels from υ′ = 0–12 have also been determined. From zero angle spectra, the limiting oscillator strengths for transitions to the B 1Σ+, C 1Σ+, and E 1Π states have been determined. The values are 0.0153 ± 0.0014, 0.163 ± 0.015, and 0.094 ± 0.009, respectively; υ′ = 0 in each case. Relative intensities in the fourth positive bands have also been determined (and redetermined) at various angles and kinetic energies. Possible variation in relative intensities with scattering angle is discussed. A possible reason is given for the large discrepancy (a fac...