N₂-shift coefficients in the 谓₃ band of ¹²CH₄ at room temperature

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• 作者：Bastien Vispoel ; Miguë ; l Dhyne ; Jean-Claude Populaire ; Ghislain Blanquet ; Muriel Lepè ; re ; ^{muriel.lepere@unamur.be" class="auth_mail}
• 关键词：Methane ; Diode-laser spectroscopy ; Line shifts
• 刊名：Journal of Molecular Spectroscopy
• 出版年：April, 2014
• 年：2014
• 卷：298
• 期：Complete
• 页码：7-10
• 全文大小：574 K

文摘

Using a dual beam diode-laser spectrometer, we have studied with accuracy the N₂-shift coefficients in the P-branch of the 谓₃ band of methane. The experiments were performed at room temperature for 16 lines in the spectral range 2906-2948 cm^鈭? 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鈥橫an 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.