Thea1Δ(a2) States of BiCl, BiBr, and BiI

✍ Scribed by M. Beutel; K.D. Setzer; O. Shestakov; E.H. Fink

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 241 KB
• Volume: 175
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1996.0007

✦ Synopsis

The emission spectra of the a 1 D(a2) r X 2 1 transitions of BiCl, BiBr, and BiI have been observed in the near-infrared spectral region near 2 mm. The bismuth halide radicals were generated and excited in a fast-flow system by reaction of bismuth vapor (Bi x ) with the halides and microwave-discharged oxygen. The NIR chemiluminescence was measured with a Fourier-transform spectrometer equipped with Ge and InSb detectors. The spectra contain the D£ Å /2, /1, 0, 01, and 02 sequences of the X 2 1 r X 1 0 / and the D£ Å 0 sequences of the a2 r X 2 1 transitions of the radicals. Vibrational analyses have yielded improved molecular constants for the X 1 0 / and X 2 1 ground state components and the following constants of the a2 states of the three radicals (in cm 01 ): Bi 35 Cl: T e Å 11 754.53(1), v e Å 324.22(1), v e x e Å 1.063(2); Bi 79 Br: T e Å 11 478.25(1), v e Å 217.85(1), v e x e Å 0.569(1); BiI: T e Å 10 874.62(5), v e Å 166.23(3), v e x e Å 0.502(3), where the numbers in parentheses are the standard deviations of the parameters.