ACTIVE NITROGEN LUMINESCENCE STUDIES AT LIQUID-HELIUM TEMPERATURES
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abstract
An experimental technique based on the condensation of an atomic beam from a microwave discharge into superfluid helium allows low-temperature investig of nitrogen afterglow in the gas phase (T 10 K) and in liquid helium (T4.2 K). Our previous study allowed to explain the appearance of s afterglow transitions N2(B 3g A 3u+ with B 6 ( 560 nm). The present work shows that in the gaseous such large temperature decrease causes the appearance of intensive transitions from vibronic states above the dissociation energy of the N2 molecul ground state N(4S) atoms (B 13). This effect is discussed with view on the radiation of the nitrogen condensate in superfluid helium. Ma isolation experiments definitely show that this radiation (the so-called emission, 520 nm) arises during condensation and is related to the of excited N(2D) atoms trapped out of the gas phase. 1981.
