TY - JOUR
T1 - A guided-ion beam study of the reactions of N4+ with H2, HD, and D2
T2 - An evaluation of pseudo-Arrhenius analyses of ion-molecule reaction systems
AU - Schultz, Richard H.
AU - Armentrout, P. B.
PY - 1992
Y1 - 1992
N2 - Reactions of N4+ ions with H2, HD, and D2 are studied from thermal to 5 eV kinetic energy under single-collision conditions in a guided-ion beam mass spectrometer. Reactant ions are formed in a flow tube source to ensure thermalization. Despite being exothermic by 1.5 eV, formation of N2H+ (N 2D+ ) is observed to proceed with an activation barrier that we measure to be 0.09 ± 0.03 eV at 0 K, independent of the hydrogen isotopomer used. Possible reaction mechanisms are discussed, and the present results are compared to previous flow and drift tube measurements. Effects of collisional reheating on the derivation of thermochemistry in drift-tube experiments are discussed. We also discuss the difficulty of deriving reliable thermochemistry from pseudo-Arrhenius plots when the mathematical form of the cross section excitation function is unknown.
AB - Reactions of N4+ ions with H2, HD, and D2 are studied from thermal to 5 eV kinetic energy under single-collision conditions in a guided-ion beam mass spectrometer. Reactant ions are formed in a flow tube source to ensure thermalization. Despite being exothermic by 1.5 eV, formation of N2H+ (N 2D+ ) is observed to proceed with an activation barrier that we measure to be 0.09 ± 0.03 eV at 0 K, independent of the hydrogen isotopomer used. Possible reaction mechanisms are discussed, and the present results are compared to previous flow and drift tube measurements. Effects of collisional reheating on the derivation of thermochemistry in drift-tube experiments are discussed. We also discuss the difficulty of deriving reliable thermochemistry from pseudo-Arrhenius plots when the mathematical form of the cross section excitation function is unknown.
UR - http://www.scopus.com/inward/record.url?scp=33748887341&partnerID=8YFLogxK
U2 - 10.1063/1.462191
DO - 10.1063/1.462191
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AN - SCOPUS:33748887341
SN - 0021-9606
VL - 96
SP - 1046
EP - 1052
JO - Journal of Chemical Physics
JF - Journal of Chemical Physics
IS - 2
ER -