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- W2019925555 abstract "The rate of HF(v=2 and 3) removal by H atoms was measured at T=295 K. The measurements were performed by laser-induced fluorescence in a discharge flow tube in which H atoms were produced by a microwave discharge. The absolute H-atom concentrations were measured by isothermal calorimetry with a Pt wire coil as a catalytic probe. A small fraction of the injected HF(v=0) was pumped first to HF(v=1) and subsequently to HF(v=2) and HF(v=3) by the multiline output from a pulsed HF transverse excitation atmospheric (TEA) laser. The exponential decay times of the HF 3–0 fluorescence with and without the microwave discharge and the measured H-atom concentrations were used to calculate a removal rate of 6.3×1013 cm3/mol-sec for HF(v=3). This rate is ∼400 times faster than the deactivation of HF(v=1) by H atoms and ∼100 times faster than the deactivation of HF(v=2) also reported in this study. Thus, it many account for the low laser output from the higher vibrational levels that has been observed in pulsed HF lasers. There are several vibrational deactivation processes and reactions that may contribute to the measured removal rate. The present results bear directly on the construction of potential energy surfaces used for theoretical predictions of upper level deactivation rates." @default.
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- W2019925555 date "1977-04-01" @default.
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- W2019925555 title "The vibrational deactivation of HF(<i>v</i>=3) and HF(<i>v</i>=2) by H atoms" @default.
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- W2019925555 doi "https://doi.org/10.1063/1.434347" @default.
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