Radiation Effects in Solid Nitrogen

A new approach to studying the luminescence spectra of free icosahedral and crystalline argon nanoclusters

“…In the higher-energy spectral range, we can see emission from partly vibrationally relaxed (W′ band at 10.6 eV) and vibrationally excited (asymmetric W band with a maximum at 11.3 eV) states of (Ar 2 ) * molecules in clusters. It should be noted that in bulk samples of solid argon the W band has a significantly lower relative intensity than it has in clusters [12,13].…”

Luminescence of Molecular Nitrogen Nanoclusters Containing Stabilized Atoms

“…There are several approaches for the creating the N 4 species. The formation of N 4 + cations followed by a neutralization reaction with electrons has been experimentally realized. − However, the association of two metastable N 2 (A 3 Σ u + ) molecules was suggested as an alternative mechanism for the formation of N 4 polynitrogen . The conditions during our experiments are ideal for testing this suggestion.…”

“…Theoretical calculations have evaluated the structure and stability of numerous isomers of possible N n molecules with n ranging from 3 to 60, but only some of the isomers are good candidates for HEDM. Neutral and ionic species N 3 , N 3 + , N 3 – , N 4 + , were detected and studied in solid nitrogen films. − A cation N 5 + has been synthesized as a part of a compound. , There are some detailed reviews of experimental and theoretical work on polynitrogen compounds in the literature. , Experimental evidence was obtained for the existence of tetranitrogen (tetrazete), N 4 , in the gas and solid phases. − Matrix-isolated tetranitrogen was obtained by condensing products of an electrical discharge on a cold window, or by bombarding solid nitrogen by electrons . In the later case an intense broad band at λ = 360 nm was observed, which was assigned to the emission of N 4 ( D 2 h ) tetranitrogen.…”

Advances in Spectroscopy of Subthreshold Inelastic Radiation-Induced Processes in Cryocrystals

“…Figures 5 and 6 show examples of evolution of luminescence spectra of RGS under irradiation by electrons ( Fig.5) and photons (Fig.6). In all cases a pronounced increase in the intensity of the defect component during irradiation has been observed for A-STE ( Fig.6a-c), M-STE ( Fig.5a) and for impurity atomic emissions ( Fig.5b) in solid Xe [10,18,19], Kr [18,20], Ar [18,22,25] and Ne [6,25,26], evidencing the accumulation of stable longlived defects in the lattice. Since the energy of STE is transferred into kinetic energy of atomic motion over a unit cell, the formation of three-, two-, or one-dimensional defects is ruled out.…”

“…The formation of H-band emitting centers (R 2 + )* occurs through the excitation of STH by an exciton. The bulk recombination of trapped holes with electrons populates the (R 2 *) states with subsequent M-band emission [22]. After surface recombination of STH with electrons the excited dimers escape from the surface of the crystal with subsequent W-band emission.…”