Etude des mouvements de molécules linéaires en phase liquide par analyse du profil des bandes d'absorption infrarouge. I. Oxyde nitreux

Measurements have been made of the width and profile of the three fundamental vibration bands and of some harmonics of the N 2 O molecule in solution in a large number of solvents. In the case of some non polar solvents the widths of the bands observed appear to be determined by rotational motions of the solute molecules; in other cases variations in the intermolecular potential cannot be neglected. The correlation functions and corresponding moments were then calculated; the values obtained are interpreted using the hypothesis that the width arises as a result of rotation and rotational diffusion movements of the molecule; they appear approximately in agreement with theory in the case of non polar solvents. In addition, we give an approximate value of the torque acting on the N 2 O molecule in liquid medium.