ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
The A˜–X˜ fluorescence excitation spectrum of HCN has been recorded using 4-wave mixing in Sr vapor as a tunable vacuum ultraviolet source. The excitation spectra are notable for the high signal to noise ratio, resolution (FWHM ∼0.3 cm−1) of nearly all previously blended lines, and accuracy of wavelength calibration (±0.03 cm−1). Measured lifetimes for the first three bending levels of the A˜ state [τ(000)1=13±7 ns, τ(010)1=130±24 ns, and τ(020)1〈2 ns] qualitatively confirm the results of Hsu, Smith, and Wallace [Chem. Phys. Lett. 111, 219 (1984)]. Stern–Volmer fluorescence quenching studies reported here yield a best fit quenching constant for the A˜(000)1 rotational levels of Kq =73/μs⋅Torr, which is similar to the quenching constant of the A˜(010)1 level (Kq =24.3±0.4/μs⋅Torr).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.457809
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