Pressure broadening studies on vibration-rotation bands II. The effective collision diameters

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Abstract
Using the methods described in part I, the line widths in the fundamental vibration rotation bands of deuterium chloride and carbon monoxide have been measured, under conditions of self-broadening and also in the presence of added gases. The optical collision diameters have been calculated an d com pared with the molecular diameters derived from viscosity data. An attempt has been made to interpret the high effective collision diameters found in term s of intermolecular interactions of different types, and it is concluded that London dispersion forces, resonant dipole effects and quadrupole interactions may be important. The variatin of line width in aband as a function of J quantum number has been measured and considered in terms of these interactions. The results suggest th t further studies of this kind may throw further light not only upon the nature of intermolecular forces but also upon the factors affecting energy transfer in collision.

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