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Người trình bày: TS. Lê Công Tường

Bộ môn Vật lí Đại cương, Khoa Vật lí

Trường Đại học Sư phạm Hà Nội

Thời gian: 16h00 Thứ Tư, ngày 28 tháng 12 năm 2022

Địa điểm: Phòng 222 Khoa Vật lí, 136 Xuân Thủy, Cầu Giấy, Hà Nội

Pressure dependences of line parameters of the 4427.816365 cm-1 transition of CH4

broadened by N2 at room temperature

In this work, the affection of the Dicke narrowing effect on the spectral shape of the R(7)F1 transition of methane diluted in nitrogen was studied using the Hard- and the Soft- collision line-shape models. Room-temperature absorption spectra of CH4 broadened by N2 were measured at a wide range of pressure using a difference-frequency laser spectrometer. Measured spectra of the studied transition were then one-by-one fitted with the simple Voigt profile as well as the two line-shape models considered the Dicke narrowing effect at two different assumptions of velocity-changing collisions: hard- and soft- collisions. The obtained results were confirmed that using these two models leads to better qualities of fit respect to the Voigt profile. Pressure-dependences of the line-shape parameters were also observed for the considered transition. The results shown a good agreement with other studies.