On the mechanism of populating 3p levels of neon under pumping by a hard ioniser

Nuclear-Induced Plasmas of Gas Mixtures and Nuclear-Pumped Lasers

“…However, this work did not receive recognition: In the review article [18], it was not mentioned, and in monograph [3], it was questioned with reference to [95]. During the study of luminescence of He-Ne mixtures with quenching additives [30], we have obtained results confirming the main conclusion in [79]-the principal and clearly dominant channels of neon 3p levels population in pumping by a hard ionizer are the processes unrelated to dissociative recombination of molecular ions of neon.…”

“…Fluctuations of plasma component concentrations induced by the track structure may have some effect on NPL characteristics excited by fission fragments, if population of upper levels is due to the fast charge process, for example, in laser on a mixture of He-Cd [28]. The influence of plasma track structure on recombination processes will be insignificant, as the track lifetime is much less than the characteristic time of recombination processes [29,30]. Tracks' overlapping occurs at high pumping power densities; therefore, the track structure of plasma disappears.…”

“…In this regard, it is sometimes advisable to use the so-called small models for calculation, which includes only the basic plasma processes, examples of such models [40,41]. It should be noted that in many cases the basic level population process is either not defined (e.g., lasers with Xe, Kr, Ar IR transitions), or under discussion (e.g., laser on the 3p-3s transitions of neon [30,31]). In other cases, relevant calculation is hindered by a large uncertainty in the values of (or even the order of magnitude) processes rate constants [42], the uncertainty in coefficient of light absorption by active medium particles [43].…”

“…Electrons in this region do not participate in recombination processes and this region supplies electrons in the subthreshold region. The electrons of inelastic region excitation and ionization cascade possibly play a major role in population of 3p levels of neon [30,31].…”

Optical Emission of the Nuclear-Induced Plasmas of Gas Mixtures

“…Then, for ∼ 10 −10 cm 3 s −1 and ∼ 4 ⋅ 10 12 cm −3 s −1 , the presence of impurities at a level of 10 −4 % in an He-Ne mixture is sufficient to markedly decrease the intensity. In fact, the intensity at 585 nm in an He-Ne mixture decreases by a factor of 2 at an admixture pressure 0.4 ÷ 1.3 kPa [8,25].…”