Ar-Broadening of isotropic Raman lines in the ν2 band of acetylene

Linewidths of C2H2 perturbed by H2: experiments and calculations from an ab initio potential

“…In order to improve the S/N ratio of the experiment, two additional broadband mirrors are used to The sample cell is a variation of a design already in use in our laboratory for lowtemperature measurements. [1] The system is based on the controlled evaporation of liquid nitrogen to generate a continuous flow of cold nitrogen vapor that is circulated through one of the jackets of the sample cell and cools down the sample. The final temperature can be adjusted by controlling the rate of evaporation.…”

“…1-6 and references therein]. Acetylene is also a trace constituent of the Earth's atmosphere, mainly produced by anthropogenic sources (see refs in [1][2][3][4][5][6].…”

“…The accuracy of the surface is tested by a quantum determination of pressure broadening coefficients which are compared with current experimental measurements of isotropic Raman lines of the acetylene ν 2 band at 143 K. The experimental technique used for this purpose is stimulated Raman loss spectroscopy [1,44]. Such experimental data are the first ones 3 reported for the title collisional system.…”

CO2-broadening coefficients in the ν4+ν5 band of acetylene

“…We have previously determined N 2 -, O 2 -, H 2 -, He-, Ar-, Kr-, Xe-, and self-broadening coefficients in the m 5 band of C 2 H 2 [6][7][8][9][10][11][12][13][14][15][16][17]. Other measurements were carried out for transitions in the same band as well as in other bands with broadening gases N 2 [18][19][20], O 2 [18], H 2 [18,20], He [18], Ne [18], Ar [18,19,[21][22][23], Kr [18], Xe [18], and C 2 H 2 [18,19,[24][25][26]. To our knowledge, no CO 2 -broadening coefficients of C 2 H 2 have been yet reported.…”

High‐resolution stimulated Raman spectroscopy and analysis of the ν1/ν5 (C–H) stretching dyad of C2H4

“…This experimental setup has been described in detail in previous publications, [28,29] and only a brief overview will be given here emphasizing the details that are of relevance to this work. Some modifications recently introduced in the experimental setup and used for the first time in this work will also be discussed.…”