Time-resolved kinetic studies of the N2+ + N2 association reaction

Michael James Frost, C R J Sharpe

Research output: Contribution to journalArticle

Abstract

In this work, we apply a technique in which N2+ ions are formed by resonance enhanced multiphoton ionisation (REMPI) and monitored by laser-induced fluorescence (LIF) to measure reaction kinetics. Using this approach, we are able to measure pressure-dependent rate constants for the N2+ + N2 + M ? N4+ + M association reaction over the pressure ranges 1-13 Torr N2 and 10-950 Torr He. In these ranges we find evidence for fall-off behaviour in the kinetics. Constraining the high pressure limiting rate constant (k8) to the ion-induced dipole capture rate constant for N2+ + N2 collisions (8.3 × 10-10 cm3 s-1), we extract low pressure limiting rate constants (k°) and fall-off broadening parameters(Fcent). For M = He, we find k° = 2.02(±0.20) × 10-29 cm6 s-1 and Fcent = 0.465(±0.024) and for M = N2 we find k° = 5.83(±0.40) × 10-29 cm6 s-1 and Fcent = 0.517(±0.117). Both the low pressure limiting rate constants and the observed fall-off behaviour are analysed using statistical treatments for the reaction based upon the formation of a linear N44 energised adduct. These treatments are found to interpret our data very satisfactorily.

Original languageEnglish
Pages (from-to)4536-4541
Number of pages6
JournalPhysical Chemistry Chemical Physics
Volume3
Issue number20
DOIs
Publication statusPublished - 2001

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association reactions
kinetics
low pressure
laser induced fluorescence
adducts
ions
reaction kinetics
dipoles
ionization
collisions

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Frost, Michael James ; Sharpe, C R J. / Time-resolved kinetic studies of the N2+ + N2 association reaction. In: Physical Chemistry Chemical Physics. 2001 ; Vol. 3, No. 20. pp. 4536-4541.
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abstract = "In this work, we apply a technique in which N2+ ions are formed by resonance enhanced multiphoton ionisation (REMPI) and monitored by laser-induced fluorescence (LIF) to measure reaction kinetics. Using this approach, we are able to measure pressure-dependent rate constants for the N2+ + N2 + M ? N4+ + M association reaction over the pressure ranges 1-13 Torr N2 and 10-950 Torr He. In these ranges we find evidence for fall-off behaviour in the kinetics. Constraining the high pressure limiting rate constant (k8) to the ion-induced dipole capture rate constant for N2+ + N2 collisions (8.3 × 10-10 cm3 s-1), we extract low pressure limiting rate constants (k°) and fall-off broadening parameters(Fcent). For M = He, we find k° = 2.02(±0.20) × 10-29 cm6 s-1 and Fcent = 0.465(±0.024) and for M = N2 we find k° = 5.83(±0.40) × 10-29 cm6 s-1 and Fcent = 0.517(±0.117). Both the low pressure limiting rate constants and the observed fall-off behaviour are analysed using statistical treatments for the reaction based upon the formation of a linear N44 energised adduct. These treatments are found to interpret our data very satisfactorily.",
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Time-resolved kinetic studies of the N2+ + N2 association reaction. / Frost, Michael James; Sharpe, C R J.

In: Physical Chemistry Chemical Physics, Vol. 3, No. 20, 2001, p. 4536-4541.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Time-resolved kinetic studies of the N2+ + N2 association reaction

AU - Frost, Michael James

AU - Sharpe, C R J

PY - 2001

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N2 - In this work, we apply a technique in which N2+ ions are formed by resonance enhanced multiphoton ionisation (REMPI) and monitored by laser-induced fluorescence (LIF) to measure reaction kinetics. Using this approach, we are able to measure pressure-dependent rate constants for the N2+ + N2 + M ? N4+ + M association reaction over the pressure ranges 1-13 Torr N2 and 10-950 Torr He. In these ranges we find evidence for fall-off behaviour in the kinetics. Constraining the high pressure limiting rate constant (k8) to the ion-induced dipole capture rate constant for N2+ + N2 collisions (8.3 × 10-10 cm3 s-1), we extract low pressure limiting rate constants (k°) and fall-off broadening parameters(Fcent). For M = He, we find k° = 2.02(±0.20) × 10-29 cm6 s-1 and Fcent = 0.465(±0.024) and for M = N2 we find k° = 5.83(±0.40) × 10-29 cm6 s-1 and Fcent = 0.517(±0.117). Both the low pressure limiting rate constants and the observed fall-off behaviour are analysed using statistical treatments for the reaction based upon the formation of a linear N44 energised adduct. These treatments are found to interpret our data very satisfactorily.

AB - In this work, we apply a technique in which N2+ ions are formed by resonance enhanced multiphoton ionisation (REMPI) and monitored by laser-induced fluorescence (LIF) to measure reaction kinetics. Using this approach, we are able to measure pressure-dependent rate constants for the N2+ + N2 + M ? N4+ + M association reaction over the pressure ranges 1-13 Torr N2 and 10-950 Torr He. In these ranges we find evidence for fall-off behaviour in the kinetics. Constraining the high pressure limiting rate constant (k8) to the ion-induced dipole capture rate constant for N2+ + N2 collisions (8.3 × 10-10 cm3 s-1), we extract low pressure limiting rate constants (k°) and fall-off broadening parameters(Fcent). For M = He, we find k° = 2.02(±0.20) × 10-29 cm6 s-1 and Fcent = 0.465(±0.024) and for M = N2 we find k° = 5.83(±0.40) × 10-29 cm6 s-1 and Fcent = 0.517(±0.117). Both the low pressure limiting rate constants and the observed fall-off behaviour are analysed using statistical treatments for the reaction based upon the formation of a linear N44 energised adduct. These treatments are found to interpret our data very satisfactorily.

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