High-Resolution Laser Excitation Spectroscopy of the A1Σ+-X1Σ+ Transition of BaS

✍ Scribed by Z. Morbi; P.F. Bernath

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 610 KB
• Volume: 171
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1995.1113

✦ Synopsis

The high-resolution laser excitation spectrum of the (A^{1} \Sigma^{+}-X^{1} \Sigma^{+})transition of BaS was recorded. The BaS molecule was prepared by a gas-phase reaction of Ba metal vapor with (\mathrm{CS}{2}) in a Broida oven. The (2-0,3-0,4-0,5-0,5-1,6-1,7-1,7-2,8-2,9-2), and (8-3) vibrational bands were rotationally analyzed. Approximately 600 lines for the main isotopomer ({ }^{138} \mathrm{Ba}^{32} \mathrm{~S}(67.5 %)) were measured and fitted to yield spectroscopic constants for the (A^{\prime} \Sigma^{+})and (X^{1} \Sigma^{+})states. The (A^{1} \Sigma^{+}) state is found to be extensively perturbed by two low-lying electronic states, the (A^{\prime \prime} \Pi) and (a^{3} \Pi{i}). (c) 1995 Academic Press, Inc.