TY - JOUR

T1 - On the Mechanism of Ionic-Cluster Excitation of Argon Levels in Molecular Gas Mixtures

AU - Zarvin, A. E.

AU - Madirbaev, V. Zh

AU - Dubrovin, K. A.

AU - Kalyada, V. V.

N1 - Funding Information: The study was conducted using the shared equipment at the Applied Physics Centre at NSU’s Physics Department with the financial support of the RFBR (grant no. 20-01-00332) and the Ministry of science and higher education of the Russian Federation, (project number FSUS-2020-0039). Publisher Copyright: © 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.

PY - 2022/1

Y1 - 2022/1

N2 - In this paper, the features of the process of argon radiation mixed with molecular and atomic impurities in condensing supersonic jets are studied experimentally. The mixture particles were activated by a well-focused electron beam. The dependence of the radiation intensity of individual argon lines on the gas-dynamic parameters in the jet is studied by changing the total density of the gas mixture due to changes in the stagnation pressure in the gas source chamber. The anomalous increase in the radiation intensity in a certain pressure range, which is different for different compositions of mixtures, was recorded on individual lines of atomic argon (Ar-I). At the same time, a similar effect was not detected in the spectrum of argon ions (Ar-II). It is established that anomaly was caused by the highly efficient molecular cluster mechanism of selective excitation of individual levels of argon atoms. It is absent in non-condensing jets and weakens at the stage of formation of large clusters. The main channels of energy transmission are discussed. The empirical model of the excitation-radiation process based on the obtained data was proposed.

AB - In this paper, the features of the process of argon radiation mixed with molecular and atomic impurities in condensing supersonic jets are studied experimentally. The mixture particles were activated by a well-focused electron beam. The dependence of the radiation intensity of individual argon lines on the gas-dynamic parameters in the jet is studied by changing the total density of the gas mixture due to changes in the stagnation pressure in the gas source chamber. The anomalous increase in the radiation intensity in a certain pressure range, which is different for different compositions of mixtures, was recorded on individual lines of atomic argon (Ar-I). At the same time, a similar effect was not detected in the spectrum of argon ions (Ar-II). It is established that anomaly was caused by the highly efficient molecular cluster mechanism of selective excitation of individual levels of argon atoms. It is absent in non-condensing jets and weakens at the stage of formation of large clusters. The main channels of energy transmission are discussed. The empirical model of the excitation-radiation process based on the obtained data was proposed.

KW - Anomalous luminescence

KW - Electron-beam excitation

KW - Molecular gas mixtures

KW - Supersonic clustered argon flows

UR - http://www.scopus.com/inward/record.url?scp=85118623317&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/bc574474-504d-30f0-ac25-a8c3d0ebadc4/

U2 - 10.1007/s11090-021-10214-2

DO - 10.1007/s11090-021-10214-2

M3 - Article

AN - SCOPUS:85118623317

VL - 42

SP - 247

EP - 265

JO - Plasma Chemistry and Plasma Processing

JF - Plasma Chemistry and Plasma Processing

SN - 0272-4324

IS - 1

ER -