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The gas-phase vibration-rotation emission spectrum of the \(\mathrm{CD}\) radical in the \(X^{2} \Pi\) state was observed in the \(1832-2150 \mathrm{~cm}^{-1}\) region with a high-resolution Fourier transform spectrometer. The CD radicals were generated by a dc discharge in a \(\mathrm{CD}_{4}\) and He mixture. The spectra of the \(v=1-0\) and \(2-1\) bands were analyzed by an effective Hamiltonian in Hund's case (a) parity-conserving basis set written in the \(\mathbf{N}^{2}\)-formalism. Molecular constants of the vibrationally excited states were determined for the first time with a high precision, and the equilibrium molecular constants were determined: \(\omega_{\mathrm{e}}=2100.3457(10) \mathrm{cm}^{-1}, \omega_{\mathrm{e}} x_{\mathrm{c}}=34.15582(39) \mathrm{cm}^{-1}, B_{\mathrm{e}}\) \(=7.807826(33) \mathrm{cm}^{-1}\), and \(\alpha_{\mathrm{c}}=0.212255(80) \mathrm{cm}^{-1}\), with one standard deviation given in parentheses. The internuclear distance, \(r_{e}\) was also determined to be \(1.117915(10) \AA\) from the corrected equilibrium rotational constant for the second-order electronic contribution to the rotational constant. Quantitative discussions on the Herman-Wallis

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Author

I. Morino; K. Matsumura; K. Kawaguchi

Publisher

Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 0022-2852)

Published

1995

Language

EN

Field

Chemistry (Physical Sciences)