PRESSURE-INDUCED INFRARED ABSORPTION OF NITROGEN AND NITROGEN-FOREIGN GAS MIXTURES AT $298^{\circ}K$

Author Institution: Department of Physics, Memorial University of NewfoundlandThe fundamental vibration-rotation band of Nitrogen at $2331 cm^{-1}$ has been investigated in pure $N_{2}$, and $N_{2}-H_{2}$ and $N_{2}-He$ binary mixtures at pressures up to 2000 atmospheres at $298^{\circ} K$. Absorption profiles in the pure $N_{2}$ indicate the existence of O, Q and S branches, having the band maximum at the fundamental vibrational frequency computed from the known molecular constants. No shift in the frequency of the band maximum was observable for the absorption contours obtained in the gas mixtures. However, in $N_{2}-H_{2}$ mixtures, the intensity of the Q branch diminished relative to that of the O and S branches, whereas in $N_{2}$-He mixtures little change in shape of the absorption contour, in comparison with that of the pure $N_{2}$, was observed. Integrated absorption coefficients have been measured, and the binary and ternary absorption coefficients were determined from the polynomial from expressed in terms of partial densities of component gases. Work on $N_{2}-Ar$ mixtures is being carried out at the time of preparation of this abstract and the results of this part will also be discussed