High Resolution Infrared Spectrum of the C–F Stretching Mode of CH2F37Cl

✍ Scribed by A. Baldacci; P. Stoppa; S. Giorgianni; R. Visinoni; A. Baldan

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 348 KB
• Volume: 183
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1997.7273

✦ Synopsis

Diode laser spectra of CH 2 F 37 Cl (95% isotopically pure sample) have been recorded in the 9.4 mm region characterized by the n 4 fundamental. The spectral analysis allowed the assignment of more than 3700 transitions with J £ 92 and K a £ 16 of the expected a/b-hybrid structure. The n 4 fundamental, whose origin is at 1067.7140 cm 01 , mainly interacts through a-and b-type Coriolis coupling with the n 9 fundamental located at lower wavenumbers near 1002 cm 01 . Local effects arising from Fermi resonance with n 5 / n 6 have been observed for the K a Å 14 level. An effective set of upper state molecular constants was determined by fitting the less perturbed transitions to the Watson's A-reduction Hamiltonian in the I r representation. Due to the second-order a-type Coriolis resonance, a number of perturbation-allowed transitions of n 9 were observed and assigned near the avoided crossing. Using a suitable program, we experienced a two band system analysis which produced the molecular constants of the £ 4 Å 1 and £ 9 Å 1 states along with the interaction parameter. From spectral simulation of n 4 , the ÉDm a /Dm b É dipole moment ratio was estimated to be 1.8 { 0.2.