N2-shift coefficients in the ν3 band of 12CH4 at room temperature
Journal of Molecular Spectroscopy, 2014•Elsevier
Using a dual beam diode-laser spectrometer, we have studied with accuracy the N 2-shift
coefficients in the P-branch of the ν 3 band of methane. The experiments were performed at
room temperature for 16 lines in the spectral range 2906–2948 cm− 1 with J values between
7 and 11. Each line was recorded at four different nitrogen pressures ranging from 17 to 302
mbar. The collisional shifts were obtained by fitting to the experimental lineshape a Rautian–
Sobel'Man profile that takes into account the Dicke narrowing. The shift coefficients were …
coefficients in the P-branch of the ν 3 band of methane. The experiments were performed at
room temperature for 16 lines in the spectral range 2906–2948 cm− 1 with J values between
7 and 11. Each line was recorded at four different nitrogen pressures ranging from 17 to 302
mbar. The collisional shifts were obtained by fitting to the experimental lineshape a Rautian–
Sobel'Man profile that takes into account the Dicke narrowing. The shift coefficients were …
Abstract
Using a dual beam diode-laser spectrometer, we have studied with accuracy the N2-shift coefficients in the P-branch of the ν3 band of methane. The experiments were performed at room temperature for 16 lines in the spectral range 2906–2948 cm−1 with J values between 7 and 11. Each line was recorded at four different nitrogen pressures ranging from 17 to 302 mbar. The collisional shifts were obtained by fitting to the experimental lineshape a Rautian–Sobel’Man profile that takes into account the Dicke narrowing. The shift coefficients were determined using a procedure where a non perturbed line of pure CH4 was simultaneously recorded with N2-shifted transitions. Finally, we give a comparison with previous published results.
Elsevier