Absolute cross-sections of fragment negative ions in electron collisions with difluoromethane

Abstract

Dissociative electron attachment (DEA) and ion-pair dissociation (IPD) processes of Difluoromethane (CH${}_2$F${}_2$) have been studied in the incident electron energy range 0 to 45 eV. Three different fragment anions (F${}^{-}$, CHF${}^{-}$ and F${}_2^{-}$) are detected in the DEA range and two anions (F${}^{-}$ and CHF${}^{-}$) are detected in IPD range. Absolute cross-section of the F${}^{-}$ fragment ion is measured for the first time. Three different resonances for both F${}^{-}$ and CHF${}^{-}$ ions and one single resonance peak for the F${}_2^{-}$ ions are observed. Constant increase in ion counts above 8 eV incident electron energy indicates the involvement of IPD process. From the experimental observation, it is speculated that near 11 eV incident electron energy both DEA and IPD processes occur simultaneously.

References in corpus (1)

• Dipolar dissociation dynamics in electron collisions with carbon monoxide

Cited by in corpus (2)

• The performance of approximate equation of motion coupled cluster for valence and core states of heavy element systems
• Electron Impact Fragmentation Dynamics of Carbonyl Sulfide: A Combined Experimental and Theoretical Study