Absolute photoabsorption (6–350 eV) and photoionization (11–80 eV) of methyl chloride using dipole electron scattering and synchrotron radiation spectroscopies Original Research Article

Absolute oscillator strenghts (cross sections) have been measured for the photoabsorption of CH3Cl at low resolution (1 eV fwhm) in the equivalent photon energy range from 6 to 350 eV and at high resolution (0.05 eV fwhm) from 6 to 50 eV using dipole (e,e) spectroscopy. In the valence shell region of CH3Cl, from the first ionization threshold to 80 eV, the photoionization efficiency, ionic photofragmentation branching ratios and absolute partial oscillator strengths for molecular and dissociative photoionization have been determined by dipole (e,e+ion) spectroscopy. The major ionic pathways of the dipole induced breakdown scheme of CH3Cl are predicted from these results and the partial photoionization oscillator strengths for production of the valence shell electronic states of CH3Cl+ are estimated. The photoabsorption data have been combined with photoelectron branching ratios for Ch3Cl, measured using monochromated synchrotron radiation at photon energies from 21 to 72 eV, to obtain partial photoionization oscillator strengths for production of the electronic states of CH3Cl+, which are compared with the partial oscillator strength estimates derived from the (e,e+ion) data.