Collision Induced Absorption in N2, CO2, and H2 at 2.3 cm−1
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Abstract
Collision induced microwave absorption is reported in pure N 2 , CO 2 , and H 2 in the region of 2.3 cm −1 . For N 2 the results are taken at temperatures ranging from 208 to 333 K and at densities ranging from 50 to 300 amagat. The parts of the loss factor which are proportional to the square and the cube of the density are found to depend respectively on T −1.55±0.12 and T −2.56±0.44 . These results are well explained by the theory which relates the virial coefficients and relaxation times to the loss factor. Both the two and three body relaxation times, τ 2 and τ 3 follow very closely a T −0.5 dependence. The ratio of τ 2 /τ 3 is found to be 0.83. For CO 2 the results are taken at temperatures ranging from 273 to 363 K and at densities ranging from 8 to 80 amagat. The parts of the loss factor which are proportional to the square and cube of the density depend respectively on T −3.08±0.05 and T −5.4±0.059 . These results together with existing infrared results show that τ 2 is nearly proportional to T −0.5 and the ratio τ 2 /τ 3 is 0.91 at 296 K. An initial measurement is reported for collision induced absorption in H 2 . The results for all three gases have been compared to previously reported results in the low frequency region.
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