Study of the Ne(^3P_2) + CH_3F Electron Transfer Reaction below 1 Kelvin

Abstract

Relatively little is known about the dynamics of electron transfer reactions at low collision energy. We present a study of Penning ionization of ground state methyl fluoride molecules by electronically excited neon atoms in the 13 $\mu$eV--4.8 meV (150 mK--56 K) collision energy range, using a neutral-neutral merged beam setup. Relative cross sections have been measured for three Ne(${}^3{P}_2$)+ CH${}_3$F reaction channels by counting the number of CH${}_3$F${}^{+}$, CH${}_2$F${}^{+}$, and CH${}_3^{+}$ product ions, as a function of relative velocity between the neon and methyl fluoride molecular beams. Experimental cross sections markedly deviate from the Langevin capture model at collision energies above 20 K. The branching ratios are constant. In other words, the chemical shape of the CH${}_3$F molecule, as seen by Ne(${}^3{P}_2$) atom, appears not to change as the collision energy is varied, in contrast to related Ne(${}^3{P}_J$) + CH${}_3$X (X=Cl and Br) reactions at higher collision energies.

15 pages, 2 figures

References in corpus (2)

• Observation of Quantum Effects in sub Kelvin Cold Reactions
• Dynamics of gas phase Ne${}^{\ast }$ + NH${}_3$ and Ne${}^{\ast }$ + ND${}_3$ Penning ionization at low temperatures

Cited by in corpus (4)

• Dynamics of gas phase Ne${}^{\ast }$ + NH${}_3$ and Ne${}^{\ast }$ + ND${}_3$ Penning ionization at low temperatures
• Observation of orbiting resonances in He(3S1) + NH3 Penning ionization
• Quantum defect model of a reactive collision at finite temperature
• Opposite effects of the rotational and translational energy on the rates of ion-molecule reactions near $0\text{K}$: the ${\text{D}}_2^{+}+{\text{NH}}_3$ and ${\text{D}}_2^{+}+{\text{ND}}_3$ reactions