Dynamics of thermoluminescence spectra of impurity– helium condensates containing stabilized nitrogen and oxygen atoms

摘要

The results of investigations of thermoluminescence dynamics during destruction of neon–helium and krypton–heliumudcondensates containing stabilized nitrogen and oxygen atoms are presented. Spectra of the thermoluminescenceudof a krypton–helium condensate contained bands of N and O atoms and NO molecules. The intensitiesudof the bands in these spectra were found to increase simultaneously during destruction processes in theudtemperature range 1.5–15 K. Observation of the NO molecules provides clear evidence for chemical reactions inudthe nanoclusters comprising the sample at low temperatures. Destruction of neon–helium samples occurred inudtwo stages. During the first stage the α-group of N atoms surrounded by Ne and N₂ molecules dominated theudspectra. During the second stage, the spectra contained intense bands of N and O atoms stabilized in a molecularudnitrogen matrix. The unusual characteristics of the thermoluminescence spectra were observed, and their changesudwere explained in terms of the shell structure of impurity nanoclusters which comprised the impurity–heliumudcondensates.