This article is cited in 6 papers

Brief Communications

Population inversion of rotational levels of diatomic molecules due to adiabatic expansion of a gas

A. N. Vargin, N. A. Ganina, V. K. Konyukhov, A. I. Lukovnikov, V. I. Selyakov


Abstract: It is shown for the first time that a population inversion of rotational levels of diatomic molecules can be obtained as a result of adiabatic expansion of a gas mixture. The inversion is a consequence of the kinetics of the rotational relaxation of molecules in a monatomic gas. The results of numerical calculations are given for different conditions of flow of HCl+He mixtures and allowance is made for one- and twoquantum collisional transitions. One-quantum radiative transitions from inverted levels j = 13–20 are found to be located in the wavelength range λ= 40–20 μ.

UDC: 621.378.325:539.196.2:539.196.5

PACS: 42.60.C

Received: 19.07.1974

 English version: Soviet Journal of Quantum Electronics, 1975, 5:3, 338–340