Fourier Transform Infrared Spectroscopy of the A1Π-X1Σ+ System of MgO

✍ Scribed by E. Kagi; T. Hirano; S. Takano; K. Kawaguchi

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 710 KB
• Volume: 168
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1994.1264

✦ Synopsis

The gas-phase infrared absorption spectrum of the (A^{1} \Pi-X^{\prime} \Sigma^{+})system of (\mathrm{MgO}) was observed in the (2700-5400 \mathrm{~cm}^{-1}) region with a high-resolution Fourier transform infrared spectrometer. The (\mathrm{MgO}) molecule was produced in a reaction of (\mathrm{Mg}) vapor with (\mathrm{N}{2} \mathrm{O}). The observed 501 spectral lines were assigned to five vibrational bands, (v{1}-v_{X}=1-0,2-0,3-0,2-1), and (0-1) of ({ }^{24} \mathrm{MgO}). These lines were analyzed to determine the band origins, the rotational, centrifugal distortion. and A-type doubling constants in the (A^{\prime} \Pi) state. The term value (T_{\mathrm{c}}) of the (A^{\prime} \Pi) state was derived to be (3563.8377(74) \mathrm{cm}^{-1}), with one standard deviation in parentheses. The rotational levels in the (A^{\prime}) II state were found to be perturbed by those of the vibrational levels of the (X^{\prime} \Sigma^{+})state through rotational-electronic interaction, and the analysis of the perturbation was carried out to determine the interaction constants. The spectra of the (v_{1}-v_{X}=1-0) bands of the isotopic species,

({ }^{25} \mathrm{MgO}) and ({ }^{26} \mathrm{MgO}), were also observed and analyzed. ⑲94 Academic Press. Inc.