Spectroscopic studies of impurity-helium condensates containing stabilized N and O atoms
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We present optical spectra of impurity-helium condensates during the process of their formation by injection of gas mixtures N2-Rg-He (Rg=Ne, Kr) into bulk superfluid helium after passing through a RF discharge. Atomic lines of He, Ne, Kr, N, O atoms as well as bands (1+ and 2+ systems of N2) are present in the spectral range 320-1100 nm studied in these experiments. We also detected spectra emitted by the samples during their destruction, stimulated by warming through the temperature range 1.5-15 K The luminescence spectra of the N-N2-He and N-N2-Ne-He samples contain only intense N(2D- 4S) (-group) and O(1D-1S) (-group) lines. For the N-N2-Ne-He sample we observed the transformation of spectra of the -group. In thermo-stimulated luminescence spectra of the N-N2-Kr-He samples, the intense -group of O atoms and M-bands of NO molecules were found. Differences in the spectra obtained during destruction of N-N2-Ne-He and N-N2-Kr-He samples may be explained by a different shell structure of the nanoclusters formed during sample preparation. Published under licence by IOP Publishing Ltd.
