On a possibility of the direct measurement of local values of hydrogen exited level population in plasma by means of the laser radiation resonance scattering method

Considered is the possibility of determining local values of the hydrogen atom density in plasma by the laser radiation resonance scattering on an organic dye. Modification of the method has been proposed consisting in the cascade resonance excitation of levels. The proposed method of the cascade level excitation makes it possible to avoid the difficulties related to the application of statistical models of atom level population and to use scanning and spectral equipment in a visible range. A 104W laser in the spectrum of 2-4 A in width is required for carrying out the experiments on the resonance light scattering in hydrogen in the region of Hsub(αsub(0)). Modern dye lasers satisfy the conditions. Using the cascade pumping 1s → 2p → 3d it is possible to increase essentially (by an order) the sensitivity of the method