LIBRARY OF CONGRESS WASHINGTON D C AEROSPACE TECHNOLOGY DIV
The paper shows that adiabatic expansion of certain mixtures of molecular gases gives rise to the condition of population inversion in terms of vibrational levels existing for a certain time. To achieve this the molecules of the mixture should have substantially different vibrational relaxation times and should be capable of exchanging the energy of the vibrational excitation. Author
Trans. of Zhurnal Eksperimentalnoi i Teoreticheskoi Fiziki. Pisma v Redaktsiyu (USSR), v3 n11 p436-9 1966.