Fourier Transform Emission Spectroscopy of the [7.3]2Δ–a2Φ and [9.4]2Φ-a2Φ Systems of ZrCl

✍ Scribed by R.S. Ram; P.F. Bernath

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 435 KB
• Volume: 196
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1999.7886

✦ Synopsis

The emission spectrum of ZrCl has been observed in the 1800 -12 000 cm Ϫ1 region using a Fourier transform spectrometer. The molecules were excited in a microwave discharge of a mixture of helium and a trace of ZrCl 4 vapor. In addition to the C 4 ⌬-X 4 ⌽ transition reported previously, numerous new bands observed in the near infrared have been classified into two electronic transitions, [7.3] 2 ⌬-a 2 ⌽ and [9.4] 2 ⌽-a 2 ⌽. Five new bands observed in the 6700 -7400 cm Ϫ1 region have been assigned as 2 ⌬ 3/2 -2 ⌽ 5/2 and 2 ⌬ 5/2 -2 ⌽ 7/2 subbands of a new electronic transition, [7.3] 2 ⌬-a 2 ⌽. The two subbands of the [9.4] 2 ⌽-a 2 ⌽ transition were previously observed by G. Phillips, S. P. Davis, and D. C. Galehouse [Astrophys. J. Suppl. 43, 417-434 (1980)], who tentatively labeled them as 2 ⌸ 1/2 -2 ⌸ 1/2 and 2 ⌸ 3/2 -2 ⌸ 3/2 subbands. A number of new bands involving higher vibrational levels have been identified for these two subbands. A rotational analysis of a number of bands of both transitions has been obtained and spectroscopic constants have been determined. Global perturbations have been observed in both spin components of the a 2 ⌽ state. The assignment of the observed electronic states has been discussed in light of recent theoretical calculations.