High-Resolution Fourier Transform Emission Spectroscopy of the C1Σ+-X1Σ+ and e3Φ-a3Δ Systems of YD

✍ Scribed by R.S. Ram; P.F. Bernath

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 758 KB
• Volume: 171
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1995.1110

✦ Synopsis

High-resolution electronic emission spectra of (Y D) have been recorded in the (690 \mathrm{~nm}) to (3 \mu \mathrm{m}) spectral region using a Fourier transform spectrometer. YD molecules were excited in a yttrium hollow cathode lamp operated with neon gas and a trace of deuterium. The observed bands have been classified into two different electronic transitions: (C^{1} \Sigma^{+}-X^{1} \Sigma^{+})and (e^{3} \Phi-a^{3} \Delta). The rotational analysis of the (0-0,1-1,2-2,0-1,1-2), and (2-3) hands of the (C^{\prime} \Sigma^{+}-X^{\prime} \Sigma^{+})system provides the following set of equilibrium molecular constants for the ground state:

[
\begin{array}{cll}
\omega_{e}=1089.1182(81) \mathrm{cm}^{-1}, & \omega_{e} x_{c}=9.8459(38) \mathrm{cm}^{-1}, & \omega_{e} y_{c}=0.0144(8) \mathrm{cm}^{-1} \
B_{c}=2.320192(10) \mathrm{cm}^{-1}, & \alpha_{c}=0.032960(6) \mathrm{cm}^{-1}, & \text { and } r_{c}=1.920404(4) \AA
\end{array}
]

Three bands observed in the red region with origins at (11398.0507(14), 11523.0523(13)), and (11611.6396(7) \mathrm{cm}^{-1}) have been assigned as the 0-0 bands of the ({ }^{3} \Phi_{2}-{ }^{3} \Delta_{1},{ }^{3} \Phi_{3}-{ }^{3} \Delta_{2}), and ({ }^{3} \Phi_{4}-^{3} \Delta_{3}) subbands. respectively, of a new (e^{3} \Phi-a^{3} \Delta) electronic transition. Several additional bands, all degraded toward higher wavenumbers, have been identified in the (7800-8500 \mathrm{~cm}^{-1}) region. The very weak intensity of these bands limited the information which could be extracted from them. c) 1995 Academic Press, Inc.