Penning ionization of the CO2 molecule by Ne* (3 3P2,0) metastable atom

Abstract

Penning ionization of the CO2 molecule by Ne* (3 3P2,0) metastable atoms is studied by electron spectroscopy. The recorded electron energy spectrum is dominated by an important vibrational progression that is decomposed over the nν1 and nν1+2ν3 vibrational series up to n=5. In addition, we observe a low-energy broad hump extending from 0.5 to 1.5 eV. The presence of this new feature is attributed to a non-van der Waals interaction between the colliding particles. Making the hypothesis that an ion–pair state channel opens during the collision, we are in a position to interpret the entire set of experimental results. We believe that the opening of this channel is responsible for the production of the CO2 molecule in an autoionized Tanaka–Ogawa Rydberg state.

Interaction of excited He and Ne rare gas metastable atoms with the CHF2Cl molecule

“…For He * /Ne * -CHF 2 Cl systems, the energy of electron spectra was calibrated by adding a small amount of Ar to the target gas. No correction was made on the spectrometer transmission to take into account the slight variation of electron energy; indeed, previous studies carried out within our laboratory had evidenced the lack of significant change of electron energy over the present range (0-5 eV) [21][22][23]. It is worth noting that, usually, it is paramount to calibrate energy transmission prior to the measurement of electronic bands branching ratio.…”