Abstract:
A method of self-consistent classical trajectory simulation of C$_2$Í$_2$–C$_2$Í$_2$ collisions has been developed. The explicitly derived equations of motion are used to calculate the vibration-rotational collisional widths of absorption lines and isotropic Raman scattering lines of acetylene within the framework of classical impact theory. Dynamic calculations were performed using the simplest atom-atomic + quadrupole-quadrupole intermolecular C$_2$Í$_2$–C$_2$Í$_2$ interaction potential. The $J$-dependences of the self-broadening coefficients of the $^{12}$C$_2$Í$_2$ ($J\le$ 40) lines in the temperature range from 150 to 700 K, as well as the exponents of temperature dependence of broadening, are calculated. A comparison is made with the available experimental data. The contribution of collisions of different types (elastic, inelastic, collision complexes) to the self-broadening of lines, as well as the role of the value of the C$_2$Í$_2$ electric quadrupole moment, is analyzed.
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