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Temperature‐dependent rate constant for the reaction of F atoms with HNO 3
Author(s) -
Bedjanian Yuri
Publication year - 2019
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.21306
Subject(s) - reaction rate constant , chemistry , analytical chemistry (journal) , quadrupole mass analyzer , atmospheric temperature range , kinetics , mass spectrometry , helium , chemical kinetics , radical , ionization , atom (system on chip) , thermodynamics , ion , organic chemistry , physics , chromatography , quantum mechanics , computer science , embedded system
The kinetics of the reaction of F atom with HNO 3 , source of NO 3 radicals widely used in laboratory studies, has been investigated at nearly 2.7 mbar total pressure of helium over a wide temperature range, T = 220‐700 K, using a low‐pressure discharge flow reactor combined with an electron impact ionization quadrupole mass spectrometer. The rate constant of the reaction F + HNO 3 → NO 3 + HF (1) was determined using both relative rate method and absolute measurements under pseudo–first‐order conditions, monitoring the kinetics of F‐atom consumption in excess of HNO 3 , k 1 = (8.2 ± 0.4) × 10 −12 exp((315 ± 15)/ T ) cm 3 molecule −1 s −1 (where the uncertainties represent precision at the 2 σ level, the estimated total uncertainty on k 1 being 15% at all temperatures). The reaction rate constant was found to be in excellent agreement with the only previous temperature‐dependent study. Experiments on detection of the reaction product, HF, have shown that NO 3 and HF forming channel of the title reaction is the dominant, if not unique, on the whole temperature range of the study.