Translational energy distributions of excited CH+ ions produced by electron impact on methane

Abstract

Fragment ion-photon coincidence (FIPCO) spectra by controlled electron impact on methane have been observed. To identify the observed ions correlating with photons and to estimate their translational energy distributions, Monte Carlo calculations have been carried out. These results indicated that the ion correlates with its own A-X and - emissions in the FIPCO spectra. The translational energy of was 0.20 eV, whereas that of ) was described by a Boltzmann distribution of 1000 K.