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Abstract
Abstract Atmospheric repetitive He discharge with 10\,ns current peak width working in the burst pulse regime was studied. The production of He $^3$S$_1$ and $^1$S$_0$ metastable states was examined using laser- collisions- induced fluorescence (LCIF) and atomic absorption spectroscopy (AAS). Both methods independently reveal a significant increase of $^3$S$_1$ population in the burst regime, depending on the plasma pulse separation time in the burst. Up to a seven-fold increase in the $^3$S$_1$ population was detected after the third pulse in a 3-pulse burst sequence (as compared to the value obtained after the first pulse or in a single pulse regime), not requiring additional applied power. The observed effect is explained by recombination between the electrons and the ground state ions (He$^+$, He$_2^+$) produced in the previous plasma pulse and refilling the volume of interest in few hundred $\mu$s.
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