Spectroscopy of Metastable Species in a Free-Jet Expansion: The D′ ← A′ Transition of IBr

✍ Scribed by X.N. Zheng; M.C. Heaven; J. Tellinghuisen

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 800 KB
• Volume: 164
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1994.1062

✦ Synopsis

The (A^{\prime} 2\left({ }^{3} \mathrm{II}\right)) state of (1 \mathrm{Br}) is observed in a free-jet expansion of (1 \mathrm{Br}) in (\mathrm{Ar}), following photolysis with ArF laser irradiation. Laser excitation spectra are recorded for the (D^{\prime} 2\left({ }^{3} P_{2}\right) \leftarrow A^{\prime}) transition. The data include high-resolution. rotationally analyzed measurements for 34 bands in ({ }^{127}{ }^{19} \mathrm{Br}) and 37 in ({ }^{127} 1^{81} \mathrm{Br}), plus bandhead measurements for (>300) bands recorded in low resolution. The data span (v^{\prime \prime}=0-5) and (v^{\prime}=24-97). The results from the analysis of these data are merged with preliminary results from a study of the (D^{\prime} \rightarrow A^{\prime}) emission spectrum to yield spectroscopic constants valid for (v^{\prime}=0-97 . v^{\prime \prime}=0-22). The primary constants ( (\mathrm{in} \mathrm{cm}^{-1}) ) are (\Delta T_{\mathrm{c}}=28018.98, \omega_{c}^{\prime}=) 123.088, (\omega_{\mathrm{c}} x_{\mathrm{c}}^{\prime}=0.2820, B_{\mathrm{c}}^{\prime}=0.02853, \omega_{\mathrm{c}}^{\prime \prime}=147.633, \omega_{\mathrm{e}} x_{\mathrm{c}}^{\prime \prime}=1.258), and (B_{\mathrm{c}}^{\prime \prime}=0.04298). (c) 1994 Academic Press. Inc.