Digital Atlas of Electronic Vibrational-Rotational Transitions in Deuterium and Protium Molecules
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tal Atlas of Electronic Vibrational-Rotational Transitions in Deuterium and Protium Molecules V. I. Troynova,b,*, A. M. Zimina, and M. R. Nurgalievb a
Bauman Moscow State Technical University, Moscow, 105005 Russia Research Center Kurchatov Institute, Moscow, 123098 Russia *e-mail: [email protected]
b National
Received July 5, 2017
Abstract—The analysis of radiation associated with electronic vibrational-rotational (EVR) transitions in molecules of hydrogen isotopes is very informative for studying processes in the tokamak edge plasma. Emission spectra together with atomic lines are represented by a set of overlapping molecular bands with a pronounced rotational structure. The identification of the rotational lines of the spectrum is a very laborious task that is complicated by the overlapping of numerous vibrational bands, which requires the analysis of a huge number of EVR transitions. The computer recognition of the spectrum and its use for the determination of plasma characteristics are complicated, since there is no digital atlas of radiative transitions for hydrogen isotope molecules. The digital atlas created by the authors on the basis of available literature sources and described in this paper contains information on more than 57 electronic transitions and 7000 lines for deuterium molecules, as well as 69 electronic transitions and 13 400 lines for protium. The atlas contains not only the wavelengths and corresponding energies but also the constants necessary for calculations (vibrational and rotational quantum numbers, tabular intensities, branch type, etc.). The atlas was created to be published on the Internet as a public digital resource. It is implemented as a Web site which will be hosted on a server of one of the organizations involved in atlas development. In order to provide the possibility of using the atlas to interested users from other countries, all its interfaces are made in English. Keywords: molecules of hydrogen isotopes, electronic vibrational-rotational transitions, digital atlas, characteristics of molecular radiation DOI: 10.1134/S1063778818070128
INTRODUCTION Among the processes in tokamak edge plasma that determine its state, the recycling of hydrogen isotopes (protium and deuterium) is of great importance. This phenomenon is associated with the inward flux of atoms and molecules of orifice gas produced in the process of ion recombination on the surface of the walls of the chamber and diaphragm (a limiter). The ratio of the flux of neutral particles (atoms, molecules) returning to the plasma to the incident flux is characterized by the effective recycling coefficient. Since the outward particle flux can also lead to the desorption of the particles previously captured by the wall, sometimes the value of this coefficient can exceed 1. The uncertainty of recycling characteristics may result in difficulties in the interpretation of the tokamak modes of operation. The molecules of hydrogen isotopes play an important role in the balances of the energy and particles of the tokamak edge
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