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The rate of the chemiluminescent Ba+N2O→BaO*+N2 reaction is greatly enhanced inside cold (0.38 K) helium droplets. If Xe atoms are added to the droplets, the “hot” surface channel is suppressed and all the emission is in a vibrational progression of sharp lines, indicating that the reaction occurs only inside the droplets.
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Lugovoj et al. (2000) studied this question.
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