Millimeter-Wave and High Resolution Infrared Spectra of D3SiBr

✍ Scribed by H. Bürger; J. Cosléou; J. Demaison; E.B. Mkadmi; M. Paplewski

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 455 KB
• Volume: 182
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1996.7225

✦ Synopsis

Millimeter-wave (mmw) spectra of D 3 Si 79 Br and D 3 Si 81 Br in the vibrational ground state have been recorded in the 150-650 GHz range. Furthermore, mmw spectra of D 3 Si 79 Br in the £ 3 Å 1 and £ 6 Å 1 states have been studied in some limited spectral ranges. FTIR spectra of monoisotopic D 3 Si 79 Br covering the bands n 3 (a 1 , 418.650 cm 01 ), n 6 (e, 464.254 cm 01 ), n 5 (e, 685.367 cm 01 ), and n 2 (a 1 , 686.373 cm 01 ) have been recorded with resolutions between 2.5 and 3.5 1 10 03 cm 01 . J-dependent ground state parameters up to sextic terms have been determined from the mmw spectra, and A 0 Å 1.425263(12) cm 01 for D 3 Si 79 Br was derived from fits of several (Dk 0 Dl) Å {3 interactions observed in the n 2 /n 5 band system. While n 3 and n 6 interact weakly by Coriolis x, y resonance, the Coriolis resonance of the almost degenerate n 2 and n 5 vibrational levels is very strong. The sign of the intensity perturbation, M 2 z 25 M 5 , is positive. Fits of the n 3 and n 6 bands (ca. 6000 IR lines) supplemented by mmw data and of the n 2 and n 5 bands (ca. 8000 lines) were obtained with rms deviations of 0.28 and 0.37 1 10 03 cm 01 for the IR data. Some hot bands of n 3 were detected and analyzed.