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- W2085456410 abstract "The v4 fundamental band of CF379Br and CF381Br, present in natural isotopic abundance, was investigated in the 8.3-μm region by high-resolution infrared spectroscopic techniques. Tuneable diode laser spectra were recorded in the ranges 1202.5–1205.0 cm−1, 1208.0–1210.1 cm−1 and 1212.5–1214.5 cm−1. The tuneable diode laser spectra were obtained at the reduced temperature of 200 K and in a free-jet expansion. The latter technique was used to reduce spectral congestion, achieving a rotational temperature of about 50 K, with a resolution up to 0.0008 cm−1. A Fourier transform infrared spectrum covering the entire spectral region of the v4 band, between 1190 and 1220 cm−1, was recorded at 298 K with a resolution of 0.004 cm−1. The experimental wavenumbers from the different spectroscopic techniques were combined to accomplish the complete ro-vibrational analysis of v4. In total, 4651 transitions were assigned to CF379Br, 4047 to CF381Br, with J″max = K″max =80; of these, 3171 for CF379Br and 2755 for CF381Br are from diode laser measurements. The data of each isotopologue were analysed using the model Hamiltonian for a degenerate vibrational state of a molecule of C3v symmetry. The v4 band of both the isotopologues resulted essentially unperturbed, but the Δl = Δk = ±2 l-resonance was found to be active within the v4 = 1 state. Precise values of the vibrational energy and of the ro-vibrational parameters of v4 = 1 for CF379Br and CF381Br were obtained. The bromine isotopic splitting amounts to 6.9 × 10−3 cm−1. In addition, the equilibrium geometry and the harmonic force field were calculated ab initio using the large-size basis set def2-QZVP in conjunction to the PBE0 functional." @default.
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- W2085456410 date "2014-01-10" @default.
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- W2085456410 title "The ro-vibrational analysis of the<i>v</i><sub>4</sub>fundamental band of CF<sub>3</sub>Br from jet-cooled diode laser and FTIR spectra in the 8.3-μm region" @default.
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- W2085456410 doi "https://doi.org/10.1080/00268976.2013.872310" @default.
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