Electron Attachment at High Temperatures

Atmospheric pressure anion mass spectrometry: electron affinities and activation energies of thermal electron attachment – perfluoromethylcyclohexane, C7F14

“…Miller and co‐workers determined the (flowing afterglow) FLAG‐12, AE a (C 7 F 14 ), 1.02(6) eV, increasing the precision of the TCT and ECD values . In 1991, Mock and Grimsrud reported photodetachment onsets of C 7 F 14 and SF 6 anions at atmospheric pressure, 3.3 eV, consistent with the 1979 study of electron attachment at 3500K indicating equal gs‐AE a (C 7 F 14 ) and gs‐AE a (SF 6 ) . Since 2000, a range of lifetimes of C 7 F 14 anions observed in alkali metal beam studies and magnetized Q machine plasma at 0.2 eV suggest multiple positive AE a (C 7 F 14 ) …”

“…The thermal electron attachment (TEA) reaction of perfluoromethylcyclohexane (C 6 F 11 ‐CF 3 ), designated C 7 F 14 hereafter, has been frequently studied along with SF 6 because of its large temperature‐independent rate constant for TEA. Yet, the ground‐state adiabatic electron affinities (energy differences between the ground state anions and neutrals), gs‐AE a ; vertical electron affinities (energy differences in the neutral geometry) VE a ; photodetachment energies (energy differences in the anion geometry), E pd ; energy for dissociative electron attachment, E dea = D(C 7 F 13 ‐F) – E a (F or C 7 F 13 ); D(C 6 F 11 ‐CF 3 ) – E a (CF 3 or C 6 F 11 ); and rearrangement energies, E rr = E pd – AE a remain uncertain since few experimental values have been reported …”

“…Subsequently, Barrera used these data to report an AE a (C 7 F 14 ), 1.06(10) eV, listed in a 2004 compilation and constructed Herschbach Ionic Morse Person Electron Curves, HIMPEC, in the C 7 F 13 ‐F and C 6 F 11 ‐CF 3 dimensions . The primary purpose of this paper is to place these results in the literature and update the comparisons to reduce the uncertainty in the kinetics and thermodynamics of thermal electron attachment to C 7 F 14 …”

“…An ideal universal electron capture detector, IUECD, proposed by Herder in 2004 to measure thermal electron attachment to molecules over a wide range of temperatures and pressures is described . Indeed, this setup could link the thermal data from ECD, beam, swarm, chemical modeling experimental facility, atmospheric pressure ion sources, CRESU (Cinétique de Réaction en Ecoulement Supersonique Uniforme)/Laval nozzle method), FLAG (flowing afterglow), NSI (negative surface ionization) sources, the magnetized Q machine plasma and alkali metal studies of thermal electron attachment to SF 6 and C 7 F 14 …”

Electron attachment to sulfur oxyhalides: SOF2, SOCl2, SO2F2, SO2Cl2, and SO2FCl attachment rate coefficients, 300–900 K

“…[9][10][11][12] Wang and Lee 13 have measured electron attachment rate coefficients for SO 2 Cl 2 in a drift tube apparatus at room temperature, and Datskos and Christophorou 14 reported rate coefficients for SO 2 F 2 from 300 to 700 K, also with a drift tube apparatus. Attachment to SO 2 F 2 has also been studied in a high-temperature plasma jet and found to be a poor attacher at 2000 K. 15 SO 2 F 2 , widely used as a fumigant, has received attention of late because of the increase in the concentration of SO 2 F 2 in the atmosphere and its high global warming potential. 16,17 The electron attachment reactions energetically possible in the present work are e − + SOF 2 The energies given in Eqs.…”