# HIGH RESOLUTION VACUUM ULTRAVIOLET STUDIES OF $A^{1}A HCN$

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 Title: HIGH RESOLUTION VACUUM ULTRAVIOLET STUDIES OF $A^{1}A HCN$ Creators: Jonas, D. M.; Zhao, X.; Solina, Stephani Ann B.; Yamanouchi, K.; Field, R. W. Issue Date: 1990 Publisher: Ohio State University Abstract: The $\tilde{A}-\tilde{X}$ 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 of nearly all previously blended lines(FWHM $\sim 0.3cm^{-1})$ and absolute wavenumber accuracy($0.03cm^{-1}$). Measured lifetimes for the first three bending levels of the $\tilde{A}$ state $[\tau (000)^{1}=13\pm 7ns, \tau(010)^{1}=130 \pm 24ns, \tau(020)^{1}<2ns]$ qualitatively confirm the unusual trend in predissociation lifetimes reported by Hsu $et al. ^{1}$ Stem-Volmer fluorescence quenching studies reported here yield a best fit quenching constant for the $\tilde{A}(000)^{1}$ level of $K_{q}=73 \mu s/Torr$, which is of the same order of magnitude as the previously reported quenching constant for the $A(010)^{1}$ level. Stark effect measurements of the $\tilde{A}$-state electric dipole moment now in progress will also be reported. Description: $^{1}$ Y. C. Hsu, M. A. Smith, and S.C. Wallace, Chem. Phys. Lett. 111,219(1984) Author Institution: Department of Chemistry and George R. Harrison Spectroscopy Laboratory, Massachusetts Institute of Technology, Cambridge; Department of Chemistry and George R. Harrison Spectroscopy Laboratory, Massachusetts Institute of Technology, Cambridge; Department of Pure and Applied Sciences, The University of Tokyo, Komaba URI: http://hdl.handle.net/1811/18120 Other Identifiers: 1990-MG-4