Resumen de High-resolution infrared spectra of HCF3 in the ν6 (500 cm−1) and 2ν6 (1000 cm−1) regions: rovibrational analysis and accurate determination of the ground state constants C0 and DK0

A. Ceausu-Velcescu, H. Bürger, G. Graner

• The high-resolution infrared spectrum of HCF3 was studied in the ν6 fundamental (near 500 cm−1) and in the 2ν6 overtones (near 1000 cm−1) regions. The present study reports on the analysis of the hot bands in the ν6 region, as well as the first observation and assignment of the 2ν6∓2 perpendicular band. Using ν6, 2ν6±2–ν6±1 and 2ν6∓2 experimental wavenumbers, accurate coefficients C0 and DK0 of the K-dependent ground-state energy terms were obtained, using the so-called “loop method.” Ground-state energy differences Δ(K,J)=E0(K,J)−E0(K−3,J) were obtained for K=3–30. A least-squares fit of 81 such differences gave the following results (in cm−1):

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