Ignition and afterglow dynamics of a high pressure nanosecond pulsed helium micro-discharge: II. Rydberg molecules kinetics

被引:32
作者
Carbone, Emile A. D. [1 ]
Schregel, Christian-Georg [1 ]
Czarnetzki, Uwe [1 ]
机构
[1] Ruhr Univ Bochum, Inst Plasma & Atom Phys, D-44780 Bochum, Germany
关键词
Rydberg molecules; nanosecond pulsed discharge; high pressure helium kinetics; plasma afterglow; ion recombination; COLLISIONAL RELAXATION PROCESSES; ROTATIONAL ENERGY RELAXATION; TUNABLE DYE-LASER; EXCITATION TRANSFER; ATMOSPHERIC-PRESSURE; N=3 STATES; ASSOCIATIVE IONIZATION; BARRIER DISCHARGE; RATE COEFFICIENT; RADIATIVE MODEL;
D O I
10.1088/0963-0252/25/5/054004
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
In this paper, we discuss the experimental results presented in Schregel et al (2016 Plasma Sources Sci. Technol. 25 054003) on a high pressure micro-discharge operated in helium and driven by nanosecond voltage pulses. A simple global plasma chemistry model is developed to describe the ions, excited atomic and molecular species dynamics in the ignition and early afterglow regimes. The existing experimental data on high pressure helium kinetics is reviewed and critically discussed. It is highlighted that several inconsistencies in the branching ratio of neutral assisted associative and dissociative processes currently exist in the literature and need further clarification. The model allows to pinpoint the mechanisms responsible for the large amounts of Rydberg molecules produced in the discharge and for the helium triplet metastable state in the afterglow. The main losses of electrons are also identified. The fast quenching of excited He (n > 3) states appears to be a significant source of Rydberg molecules which has been previously neglected. The plasma model finally draws a simplified, but still accurate description of high pressure helium discharges based on available experimental data for ion and neutral helium species.
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页数:17
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