Collisional Broadening of the J=7 ⇐ 6 Transition of t-Butyl Cyanide by CH$\text{}_{3}$CN, OCS, CO$\text{}_{2}$ and Helium

Experimental studies of the broadening of the absorption line J = 6 ⇒ 7 of (CH$\text{}_{3}$)$\text{}_{3}$CCN due to collisions with the foreign perturbers He, CO$\text{}_{2}$, OCS, and CH$\text{}_{3}$CN have been carried out. The magnitude of the broadening coefficients reflects the type of interactions occurring in the molecular collisions. It has been concluded that the dipole-dipole and dipole-quadrupole interactions are predominant in the (CH$\text{}_{3}$)$\text{}_{3}$CCN admixed with CH$\text{}_{3}$CN and OCS. In the collisions between (CH$\text{}_{3}$)$\text{}_{3}$CCN and CO$\text{}_{2}$ the dipole-quadrupole interactions are present whereas the He perturbed by (CH$\text{}_{3}$)$\text{}_{3}$CCN exhibits dispersive type of interactions.