skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

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

Abstract

The effect of quenching additives on the luminescence properties of helium - neon mixtures under pumping by {alpha} particles emitted from {sup 210}Po atoms is considered. It is concluded that, under excitation by a heavy charged particle, the population of the 3p'[1/2]{sub 0} level of neon is not related to the dissociative recombination of molecular ions. It is suggested that the most likely channels for populating the 3p level are the excitation transfer from metastable helium atoms to neon atoms and direct excitation of neon by nuclear particles and secondary electrons. (lasers and active media)

Authors:
 [1]
  1. Fotonika LLC, ul. Utegen batyra 112, 050062 Almaty (Kazakhstan)
Publication Date:
OSTI Identifier:
21544798
Resource Type:
Journal Article
Resource Relation:
Journal Name: Quantum Electronics (Woodbury, N.Y.); Journal Volume: 41; Journal Issue: 3; Other Information: DOI: 10.1070/QE2011v041n03ABEH014227
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALPHA PARTICLES; ELECTRONS; EXCITATION; HELIUM; LUMINESCENCE; MIXTURES; MOLECULAR IONS; NEON; POLONIUM 210; PUMPING; ALPHA DECAY RADIOISOTOPES; CHARGED PARTICLES; DAYS LIVING RADIOISOTOPES; DISPERSIONS; ELEMENTARY PARTICLES; ELEMENTS; EMISSION; ENERGY-LEVEL TRANSITIONS; EVEN-EVEN NUCLEI; FERMIONS; FLUIDS; GASES; HEAVY NUCLEI; IONIZING RADIATIONS; IONS; ISOMERIC TRANSITION ISOTOPES; ISOTOPES; LEPTONS; NANOSECONDS LIVING RADIOISOTOPES; NONMETALS; NUCLEI; PHOTON EMISSION; POLONIUM ISOTOPES; RADIATIONS; RADIOISOTOPES; RARE GASES

Citation Formats

Khasenov, M U. On the mechanism of populating 3p levels of neon under pumping by a hard ioniser. United States: N. p., 2011. Web. doi:10.1070/QE2011V041N03ABEH014227.
Khasenov, M U. On the mechanism of populating 3p levels of neon under pumping by a hard ioniser. United States. doi:10.1070/QE2011V041N03ABEH014227.
Khasenov, M U. 2011. "On the mechanism of populating 3p levels of neon under pumping by a hard ioniser". United States. doi:10.1070/QE2011V041N03ABEH014227.
@article{osti_21544798,
title = {On the mechanism of populating 3p levels of neon under pumping by a hard ioniser},
author = {Khasenov, M U},
abstractNote = {The effect of quenching additives on the luminescence properties of helium - neon mixtures under pumping by {alpha} particles emitted from {sup 210}Po atoms is considered. It is concluded that, under excitation by a heavy charged particle, the population of the 3p'[1/2]{sub 0} level of neon is not related to the dissociative recombination of molecular ions. It is suggested that the most likely channels for populating the 3p level are the excitation transfer from metastable helium atoms to neon atoms and direct excitation of neon by nuclear particles and secondary electrons. (lasers and active media)},
doi = {10.1070/QE2011V041N03ABEH014227},
journal = {Quantum Electronics (Woodbury, N.Y.)},
number = 3,
volume = 41,
place = {United States},
year = 2011,
month = 3
}
  • A description is given of a detailed nonsteady-state multiwave kinetic model of a laser, based on xenon atom transitions with {lambda} = 1.73, 7.03, 2.65, 2.63, 3.37, and 3.51 {mu}m in an He - Ar - Xe mixture pumped by a hard ioniser. The proposed kinetic model is tested against the results of experiments on electron-beam pumping of an Xe laser containing pure xenon, as well as binary and ternary mixtures. Numerical modelling is used to identify the main mechanisms pumping the upper active levels: three-particle recombination of atomic Xe{sup +} ions (He - Xe mixture), dissociative recombination of molecularmore » Xe{sub 2}{sup +} ions (pure Xe), dissociative recombination of molecular ArXe{sup +} ions and electron excitation from the 6s' xenon atom states in an (He) - Ar - Xe mixture. It is shown that the contribution of each of the mechanisms to pumping of the upper active level is determined by the composition and pressure of the mixture. (active media)« less
  • The results of calculations based on a new detailed nonsteady-state multiwave kinetic model of a laser based on xenon atom transitions with {lambda} = 1.73, 2.03, 2.65, 2.63, 3.37, and 3.51 {mu}m in an He - Ar - Xe mixture were compared with the results of experimental studies of a nuclear-pumped xenon laser carried out making use of several experimental setups. A satisfactory agreement between the calculations and experiments was achieved. The causes of the impairment of the nuclear-pumped xenon laser characteristics with increase in the temperature of the medium were discovered. It was found that nuclear pumping of amore » Ar - Xe mixture can result in attaining a lasing efficiency up to 3.5%. A laser nuclear-pumped by the VIR-2M reactor was fully optimised. (active media)« less
  • A proposal was made to pump an Xe-NaCl mixture by a hard ioniser with the aim of constructing a highly efficient XeCl lamp (308 nm). Under optimal conditions (pressure {approx}10 Torr, specific input energy {approx}60 - 125 W cm{sup -3} , mixture composition Xe : NaCl = 20 : 1) the efficiency of the active medium of this lamp reached 40% and the energy yield was 0.025 J litre{sup -1} . Under these conditions the gain was low (less than 10{sup -4} cm{sup -1}). (laser applications and other topics in quantum electronics)
  • The kinetic model of relaxation in the Ne-Ar-Kr mixture pumped by a hard ioniser is constructed in connection with the analysis of the possibility of lasing at the Ne{sup +}Ar{yields}NeAr{sup +} transition of the inert-gas ionic exciplexes. The calculations based on the typical rates of plasmachemical reactions demonstrate that the lasing is possible but difficult to realise: One needs high pressures (greater than 16 bar) and high pumping densities ({approx} 1 MW cm{sup -3}). In the most favourable cases, the laser efficiency lies between 0.05 and 0.25%. (active media)
  • A detailed nonstationary model of a He - Ar laser pumped by a hard ioniser is developed. It is found by numerical simulation that the pumping of the upper laser level is governed either by the three-body recombination of atomic argon ions with electrons or the dissociative recombination of molecular argon ions with electrons, depending on the argon content in a gas mixture. The conversion of dimer molecular argon ions into trimers, the quenching of the upper laser level by neutral atoms, and the spectral line broadening determine the optimum lasing conditions for the total mixture pressure and the partialmore » argon pressure for different excitation conditions. The model adequately describes experiments using electron beam and nuclear pumping. The optimisation of a 1.79-{mu}m nuclear-pumped He - Ar laser in the VIR-2M reactor gave a maximum laser efficiency of 1.2 %. (lasers)« less