Details

Autor(en) / Beteiligte

• Arseneau, D. J
• Fleming, D. G
• Senba, M
• Reid, I. D
• Garner, D. M

Titel

The ion-molecule reactivity of the positive muon molecular ions HeMu+ and NeMu

Ist Teil von

• Canadian journal of chemistry, 1988-08, Vol.66 (8), p.2018-2024

Ort / Verlag

Ottawa, Canada: NRC Research Press

Erscheinungsjahr

1988

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• Thermal (300 K) ion-molecule reaction rates are measured, using the µSR (muon spin rotation) technique, for the muonated rare gas molecular ions HeMu + and NeMu + reacting with NO, O 2 , N 2 O, NH 3 , CF 4 , C 2 H 4 , TMS, and CH 3 NO 2 . In almost every case (excepting O 2 ), both charge transfer (k e ) and muon transfer (k µ ) contribute to the reaction rate. Reaction is believed to occur from ro-vibrational excited states, [HeMu + ]* and [NeMu + ]*, due to the poor efficiency of He and Ne moderators for collisional deactivation. The total experimental rate constants, k exp  = k µ  + k e , are generally in excellent agreement with total capture rates predicted by the simple ADO theory, regardless of the degree of internal excitation. Comparisons with literature values for corresponding protonated ion reaction rates with O 2 and C 2 H 4 reveal little or no isotope effect, although it is noted that these reactions are dominated by proton transfer, in contrast to the µSR results.