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High-Resolution Infrared Spectrum of BrCN in the ν2 and ν1/2ν2 Regions

✍ Scribed by H. Bürger; S. Ma; J. Demaison; M. Le Guennec; C. Degli Esposti; L. Bizzocchi

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
157 KB
Volume
199
Category
Article
ISSN
0022-2852

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✦ Synopsis

FT infrared spectra of BrCN have been recorded in the region of the 2 band near 340 cm Ϫ1 , the 1 band near 580 cm Ϫ1 , and the 2 2 band near 690 cm Ϫ1 with a resolution between 2.9 and 4.7 ϫ 10 Ϫ3 cm Ϫ1 . The vibrational levels (01 1 0), (10 0 0), (02 0 0), (02 2 0), (11 1 0), and (20 0 0) have been analyzed employing cold bands, hot bands, and new millimeter-wave transitions. Band-by-band polynomial analyses and a combined fit of all data relevant to the 2v 1 ϩ v 2 ϭ 2 polyad levels have been performed. The latter fit considered l-resonance interactions between the (02 0 0), e and (02 2 0), e levels and Fermi resonance between the two ⌺ states (10 0 0) and (02 0 0). Altogether about 1000 pieces of data up to J ϭ 100 were fitted for each of the two isotopic species with rms of the residuals of 2-8 ϫ 10 Ϫ4 cm Ϫ1 for the infrared and 10 -120 kHz for the pure rotational data.

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