Spectroscopic observation of nitrogen anions N⁻ in solid matrices

Abstract

Analysis of old and recent experiments on thermoluminescence of cryocrystals and nanoclusters of N2, Ne, Ar, and Kr containing stabilized nitrogen atoms, suggests that the so-called γ-line may correspond to the bound-bound transition (1)D-(3)P of nitrogen anions N(-) formed in solids by the association of delocalized electrons and metastable nitrogen atoms N((2)D). The recent observations of the γ-line were accompanied by simultaneous luminescence of metastable nitrogen N((2)D) atoms and exoelectron emission. The fine structure of the γ-line at 793 nm has been experimentally observed and investigated for the first time.

Quantum vortices and thermally induced luminescence of nitrogen nanoclusters immersed in liquid helium

“…Electrons and nitrogen anions were only detected during the process of destruction of the sample, where these species could be formed during the fast release of stored energy. [44,45] Additionally, none of the above mechanisms could explain the temperature dependence of the thermoluminescence observed in this work.…”

Studies of charging mechanisms in impurity-helium condensates by means of impedance spectroscopy and current spectroscopy

“…3 and 5). Samples formed from xenon-nitrogen-helium gas mixtures are very energetic and begin to destroy even in the bulk He II [30,33]. The first and second explosions (at t = 22 and 46 s in Fig.…”

“…There are some detailed reviews of experimental and theoretical works on polynitrogen compounds in the literature [18][19][20][21]. Recently the nitrogen anion N has been observed in clusters of molecular nitrogen and rare gases during destruction of impurity-helium condensates [22]. Impurity-helium condensates are highly porous aerogellike materials formed in the bulk superfluid helium (He II) due to aggregation of impurity nanoclusters [23][24][25][26].…”

“…Trapping of radicals on nanocluster surface allows to store high concentrations of stabilized nitrogen and hydrogen atoms [26,[29][30][31][32]. Intense luminescence and current pulses accompany destructions of impurity-helium condensate (IHC) samples containing high densities of stabilized nitrogen atoms [22,[33][34][35]. Two possible mechanisms of charging impurity nanoclusters were suggested to explain observations of the current pulses [35].…”

Defect‐induced electrostatic charging of nitrogen films

“…Recent experiments confirmed the formation of electrons and positively charged ions in the IHCs grown from discharge. There have been reports on the generation of negatively charged nitrogen species N 3 − and N − in nitrogen films and the IHCs, respectively. Such a variety of charged species generated in addition to neutral reactive species like N (see, e.g., and references therein) and N 3 radicals requires a set of methods to ascertain the processes underlying electrostatic charging.…”