Emission and level population in noble gases and their binary mixtures under ion beam excitation

Хасенов, М. У.

doi:10.1016/j.nimb.2020.09.004

Cited by 8 publications

(2 citation statements)

References 37 publications

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“…In the processes: R + ( 2 P 1/2 ) + R' + M → (RR') + + M (7) molecules of heteronuclear ionic molecules (RR') + are formed. (RR') + molecule formation rate with the participation of the R + ( 2 P 3/2 ) ions hundreds and thousands of times lower due to competitive processes [14]. Bands of molecules (ArXe) + (329 nm and 506 nm; they emit from general level), (KrXe) + (491 nm), (ArKr) + (642 nm) are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

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Optical Radiation from the Sputtered Species under Excitation of Ternary Mixtures of Noble Gases by the 6Li(n,α)3H Nuclear Reaction Products

Samarkhanov

Хасенов

Batyrbekov

et al. 2021

Eurasian Chem. Tech. J.

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The present paper examines the luminescence of ternary Ar-Kr-Xe and Ne-Ar-Kr mixtures of noble gases in the spectral range from 300 to 970 nm, excited by the 6Li(n,α)3H nuclear reaction products in the core of a nuclear reactor. A thin layer of lithium applied on the walls of the experimental device, stabilized in the matrix of the capillary-porous structure, serves as a source of gas excitation. During in-pile tests, conducted at the IVG.1M research reactor, thermal neutrons interact via the 6Li(n,α)3H reaction, and the emergent alpha particles with a kinetic energy of 2.05 MeV and tritium ions with a kinetic energy of 2.73 MeV excite gaseous medium. The study was carried out in a wide temperature range. The temperature dependence of the intensity of the emission of the atoms of noble gases and alkali metals, heteronuclear ionic molecules of noble gases were studied. The obtained values of the activation energy of the emission process 1.58 eV for lithium and 0.72 eV for potassium agree well with the known values of evaporation energy. Excitation of alkali metals atoms occurs consequently of the Penning process of alkali metals atoms on noble gas atoms in the 1s-states and further ion-molecular reactions.

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Section: Resultsmentioning

confidence: 99%

“…In [12], the possibility of simultaneous radiation at transitions of atoms of noble gases and alkali metals, as well as transitions of heteronuclear ion molecules of paired mixtures of noble gases [13,14], excited by the 6 Li(n,α) 3 H nuclear reaction products were studied.…”

Section: Introductionmentioning

confidence: 99%

Optical Radiation from the Sputtered Species under Excitation of Ternary Mixtures of Noble Gases by the 6Li(n,α)3H Nuclear Reaction Products

Samarkhanov

Хасенов

Batyrbekov

et al. 2021

Eurasian Chem. Tech. J.

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Semiclassical Description of Radiative Processes Involving Heteronuclear Molecular and Quasimolecular Rare Gas Ions

2022

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Continuous absorption and emission of light by the heteronuclear rare gas (ArXe)+ and (KrXe)+ ions

Нариц

Кислов

Лебедев

2022

The Journal of Chemical Physics

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Studies of radiative transitions between the ground and charge transfer excited terms of heteronuclear rare-gas (ArXe)+ and (KrXe)+ ions with small and moderate dissociation energies (D0ArXe+ = 171 and D0KrXe+=400 meV) are reported. Potential energy curves and dipole transition matrix elements are evaluated using ab initio calculations based on CASSCF method followed by NEVPT2 treatment and perturbative description of relativistic effects as implemented in ORCA suite. We develop an efficient approach for the calculations of the Boltzmann-averaged cross sections, rate constants, absorption and emission coefficients associated with the integral contributions of the bound-bound and bound-free transitions from a manifold of rovibrational states of (RgXe)+ ion. Similar approach is used for the description of the free-free and free-bound transitions between different electronic terms of a quasimolecular (RgXe)+ ion temporarily formed during a collision of Ar or Kr atoms with Xe+ ions. Our method is based on the quantal version of the theory of non-adiabatic transitions in molecular and quasimolecular systems combined with the approximation of a quasicontinuum for rovibrational energy levels. This allowed us to obtain semianalytic expression for the integral absorption properties particularly relevant at elevated temperatures. We perform a comprehensive analysis of the identified radiative processes in local thermodynamic equilibrium (LTE) plasmas of rare gas Rg/Xe mixtures containing both atomic, Xe+, and molecular, RgXe+, ions and determine their role in the formation of the absorption and emission spectra in a wide range of wavelengths and gas temperatures. The results obtained are in good agreement with the available experimental data.

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Emission and level population in noble gases and their binary mixtures under ion beam excitation

Cited by 8 publications

References 37 publications

Optical Radiation from the Sputtered Species under Excitation of Ternary Mixtures of Noble Gases by the 6Li(n,α)3H Nuclear Reaction Products

Optical Radiation from the Sputtered Species under Excitation of Ternary Mixtures of Noble Gases by the 6Li(n,α)3H Nuclear Reaction Products

Semiclassical Description of Radiative Processes Involving Heteronuclear Molecular and Quasimolecular Rare Gas Ions

Continuous absorption and emission of light by the heteronuclear rare gas (ArXe)+ and (KrXe)+ ions

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