High-Resolution Study of the Infrared Spectrum of H3SiI in the Regions 330–680 and 1070–1360 cm−1: Accurate Determination of the Ground State Constants

✍ Scribed by Jixin Cheng; Georges Graner

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 410 KB
• Volume: 185
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1997.7363

✦ Synopsis

High-resolution FTIR spectra of H 3 SiI have been recorded in the regions 330-680 cm 01 (n 3 /n 6 ) and 1070-1360 cm 01 (2n 6 ). A detailed rovibrational study was carried out for the n 3 and n 6 fundamental bands, 2n |2 6 and 2n 0 6 overtone bands, and two hot bands, 2n {2 6 0 n {1 6 and 2n 0 6 0 n 6 . A local resonance between the £ 6 Å 2 and £ 2 Å £ 3 Å 1 states was observed. Ground state combination differences deduced from the n 3 , n 6 , 2n |2 6 , and 2n 0 6 bands allowed us to obtain accurate B 0 , D 0 J , and D 0 JK constants. The n 6 , 2n {2 6 0 n {1 6 , and 2n |2 6 bands were used for the experimental determination of the A 0 and D 0 K constants, whereas the hot band 2n 0 6 0 n 6 served to make the internal calibration coherent. Ground state differences D K (J) Å E 0 (J, K) 0 E 0 (J, K 0 3) were calculated with K up to 12. By a least-squares fit, we obtained the following results: A 0 Å 2.8426037( 14) cm 01 and D 0 K Å 2.75840(99) 1 10 05 cm 01 .