Study of thev4= 2 andv4= 3 States of PF3by High Resolution Infrared Spectroscopy

✍ Scribed by M. Badaoui; N. Ben Sari-Zizi; H. Najib; G. Graner

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 322 KB
• Volume: 184
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1997.7336

✦ Synopsis

In order to study the £ 4 Å 2 and £ 4 Å 3 states of PF 3 , two high resolution (É3 1 10 03 cm 01 ) infrared spectra were used. In the 14 mm region, 2n 0 4 and the hot band 3n {1 4 0 n {1 4 could be analysed but the 2n {2 4 and 3n {3 4 0 n {1 4 bands were not observed. Among the hot bands of n 4 at 28 mm, however, the hot bands 2n {2 4 0 n {1 4 and 3n {3 4 0 2n {2 4 could be identified. Altogether 1166 transitions of 2n 0 4 and 198 energy levels deduced from 2n {2 4 0 n {1 4 were fitted to a model taking into account the l(2,2) interaction between the £ 4 Å 2 0 and £ 4 Å 2 {2 states. Five microwave transitions were also included in the fit. A standard deviation of 0.241 1 10 03 cm 01 was obtained. A similar model for £ 4 Å 3 implying l(2,2) interaction terms between £ 4 Å 3 {1 and 3 {3 as well as between 3 /1 and 3 01 was used to fit 491 energy levels of £ 4 Å 3 {1 and 97 of £ 4 Å 3 {3 . These were deduced from hot bands; six microwave transitions were also included in the fit, which gave a standard deviation s Å 1.201 1 10 03 cm 01 . The anharmonic constants deduced from the experimental bandcenters (2n 0 4 ) 0 Å 692.84694(3) cm 01 and (3n {1 4 ) 0 Å 1039.0697(3) cm 01 are x 44 Å 00.2154 cm 01 and g 44 Å 0.4474 cm 01 . The experimental bandcenters (2n {2 4 ) 0 Å 694.695 cm 01 and (3n {3 4 ) 0 Å 1042.633 cm 01 are in fair agreement with the predictions from n 4 and the above-mentioned anharmonic constants.