R. G. Sharafutdinov

Electron beam diagnostics of nitrogen. Multiquantum rotational transitions during excitation

The electron beam diagnostics technique is widely usedto determine the parameters of a rarefied gas and is based on recording the electronic vibrational and rotational spectra of molecular gases excited by a beam of fast electrons~ In particular, for nitrogen theemitted intensity of the rotational lines can be related through an appropriate model to the gas parameters, so that one can determine the population of the rotational levels of the molecules prior to the electron beam excitation, and when the population has an equilibrium distribution one can determine the rotational temperature. The most important quantities required for the correct construction and application of a model of electron beam diagnostics are the transition probabilities for excitation of molecules by the electron beam from the ground state to an excited electronic vibrational-rotational state of the molecule.

Rotational relaxation of nitrogen in a free jet of argon

The collisional exchange of energy for rotational movement of molecules is studied a great deal both theoretically and experimentally. This is connected both with traditional problems about dispersion and absorption of ultrasound, thermal transpiration, and determination of transfer coefficients, and with comparatively new problems of calculating population kinetics for rotational levels in molecular gas masers, determination of mechanisms of cosmic laser emission, and also with other problems, where information is important not just about the rates of rotational energy transfer for the system as a whole, but about populations of individual quantum states.