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• W2022977537 abstract "NCl(b 1Σ+), PCl(b 1Σ+) and PBr(b 1Σ+) molecules have been generated in a flow reactor by passing dilute flows of NFCl2, PCl3 and PBr3 in He through a dc discharge, and the total rate constants for quenching of NCl(b 1Σ+) and PCl(b 1Σ+) by several diatomic and small polyatomic molecules have been measured at 300 K. Except for O2, NO2 and molecular halogens, the rate constants are in the 10–13– 10–14 cm3 molecule–1 s–1 range. The dependence of the rate constants on the properties of the reagent suggests that the dominant quenching mechanism for PCl(b) and NCl(b) is electronic-to-vibrational (E–V) energy transfer with the a 1Δ state as the product, just as for the reactions of NF(b 1Σ+) and PF(b 1Σ+). The rate constants for quenching of NCl(b 1Σ+) and PCl(b 1Σ+) by O2 are 1.0 × 10–12 and ⩽ 10–15 cm3 molecule–1 s–1, respectively, and are in accord with an electronic-to-electronic (E–E) energy transfer with the final states being O2(b 1Σ+)+ NCl(X 3Σ–) or PCl(X 3Σ–). Formation of PBr(b 1Σ+) from the PCl(b 1Σ+)+ Br2 reaction was observed, and quenching of PCl(b 1Σ+) by F2, Cl2 and Br2 proceeds by a chemical mechanism with rate constants of 2.3 × 10–12, 0.79 × 10–12 and 16 × 10–12 cm3 molecule–1 s–1, respectively. The radiative lifetimes for NCl(b 1Σ+), PCl(b 1Σ+) and PBr(b 1Σ+) are 2.0 ± 0.4, 4.9 ± 0.8 and 0.8 ± 0.2 ms, respectively, as determined from the decay of the respective b 1Σ+→ X 1Σ– emission intensities along the flow reactor." @default.
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• W2022977537 date "1995-01-01" @default.
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• W2022977537 title "Quenching rate constants for NCl(b¹Σ⁺) and PCl(b¹Σ⁺) and radiative lifetimes of NCl(b¹Σ⁺), PCl(b¹Σ⁺) and PBr(b¹Σ⁺)" @default.
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• W2022977537 doi "https://doi.org/10.1039/ft9959102979" @default.
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