EXPERIMENTAL DETERMINATION OF INFRARED TRANSITION DIPOLE MOMENTS FOR HNC FROM HERMAN-WALLIS EFFECT

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1997

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Ohio State University

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The transition dipole moments for the fundamental bands of HNC were obtained from analyses of Herman-Wallis effect on the absorption intensities. All the fundamental bands were measured using a Fourier transform infrared spectrometer (Bruker IFS 120HR) at Nobeyama Radio Observatory. A glow discharge in a mixture of $CH_{3}CN$ ($\sim 50$ mTorr), $H_{2}(\sim 150 \; mTorr)$, and Ar($\sim 100$ mTorr) was used for production of HNC The spectra were recorded with resolution of $0.01 cm^{-1}$ and the absorption path length was 24 m. The experimentally determined first order Herman-Wallis coefficients for the $\nu_{1}$ and $\nu_{3}$ bands, combined with the relative value of the transition dipole moments for the $\nu_{1}$ and $\nu_{3}$ bands derived from the relative intensity measurements, yielded the following values for the transition dipole moments (in Debye), using the expressions for Herman-Wallis coefficients given by $Watson^{8}$. \[ R_{1} = 0.194(13),\quad R_{2} = -0.886 (13),\quad R_{3} = -0.169 (11). \] These values are considerably larger than the corresponding values for $HCN^{h}$ and are in reasonable agreement with {ab initio} $values^{ij}$.

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$^{g}$J. K. G. Watson, J. Mol. Spectrosc. 125, 428 (1987) $^{h}$A. G. Maki et al. J. Mol. Spectrosc. 174, 365 (1995) $^{i}$P. Botschwina et al, Chem. Phys. 190, 345 (1995) $^{j}$T. J. Lee and A. P. Rendell, Chem. Phys. Lett. 177. 491 (1991)
Author Institution: Institute for Astrophysics and Planetary Sciences, Ibaraki University; Institute for Astrophysics and Planetary Sciences, Nobeyama Radio Observatory

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