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首页> 外文期刊>Plasma Sources Science & Technology >TALIF measurements of atomic nitrogen in the afterglow of a nanosecond capillary discharge
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TALIF measurements of atomic nitrogen in the afterglow of a nanosecond capillary discharge

机译：纳秒毛细管排放余量中原子氮的TALIF测量

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摘要

The atomic nitrogen (N) density in a nanosecond pulse capillary discharge is measured using two-photon laser induced fluorescence. The capillary discharge is favored for its unique combination of both large reduced fields (E/N) and high specific deposited energies. Under such conditions, we find that a pure nitrogen (N_2) capillary discharge at a pressure of 27 mbar and initial temperature of about 300 K, produces a peak N-atom density of 1.29 × 10~(17) cm~(?3), corresponding to an extremely high dissociation degree of about 10%. The time evolution of the N-atom density is tracked from a few hundred ns after discharge initiation, up to several ms when the concentration of N-atoms falls below the detection limit. The temporal evolution curve exhibits a trapezoidal-like shape, characterized by an initial rise in the N-atom density up to a few μs, followed by a relatively flat and constant profile until about 1 ms, and finally terminating with a drop to near detection limits at about 10 ms. The high electron densities (≈10~(15) cm~(?3)) and efficient production of electronically excited states associated with this type of discharge is found to have a profound effect on the consequent kinetics. A process of stepwise dissociation through electron impact of the N_2(A~3Σ_u~+,B~3∏_g,B~3∏_u) excited states is examined and proposed as a possible explanation for the unusually high energy efficiency of N-atom production. The present study shows that the capillary discharge is an extremely effective source of N-atoms, and forms the impetus for continued study of discharges with both high levels of specific deposited energies (≥1 eV/molecule) and reduced electric fields (E/N ≥150 Td).
机译：用双光子激光诱导荧光法测量了纳秒脉冲毛细管放电中的氮原子密度。毛细管放电因其大还原场（E/N）和高比沉积能量的独特组合而备受青睐。在这种条件下，我们发现在压力为27毫巴、初始温度约为300 K的纯氮（N_2）毛细管放电产生的峰值N原子密度为1.29×10~（17）cm~（-3），相当于约10%的极高离解度。从放电开始后的几百纳秒，到N原子浓度低于检测极限时的几毫秒，N原子密度的时间演化被跟踪。时间演化曲线呈梯形，其特征是N-原子密度最初上升到几μs，随后是相对平坦且恒定的轮廓，直到约1ms，最后在约10ms下降到接近检测极限。高电子密度(≈10~（15）cm~（-3））和与这种放电相关的电子激发态的有效产生对随后的动力学有着深远的影响。N_2（A~3∑u~+，B~3）的电子碰撞分步解离过程∏_g、 B~3∏_u） 对激发态进行了研究，并提出了一种可能的解释，解释了N原子产生的异常高的能量效率。目前的研究表明，毛细管放电是一种非常有效的N原子源，并为继续研究具有高水平比沉积能量的放电提供了动力(≥1 eV/分子）和减少的电场（E/N≥150 Td）。

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    T L Chng; N D Lepikhin; I S Orel; N A Popov; S M Starikovskaia;

  • 作者单位

    Laboratory of Plasma Physics (CNRS Ecole Polytechnique Sorbonne Universities University Paris- Sud) Institut Polytechnique de Paris Route de Saclay F-91128 Palaiseau France;

    Laboratory of Plasma Physics (CNRS Ecole Polytechnique Sorbonne Universities University Paris- Sud) Institut Polytechnique de Paris Route de Saclay F-91128 Palaiseau France;

    Laboratory of Plasma Physics (CNRS Ecole Polytechnique Sorbonne Universities University Paris- Sud) Institut Polytechnique de Paris Route de Saclay F-91128 Palaiseau France;

    Skobeltsyn Institute of Nuclear Physics Moscow State University Moscow 119991 Leninsky gory Russia;

    Laboratory of Plasma Physics (CNRS Ecole Polytechnique Sorbonne Universities University Paris- Sud) Institut Polytechnique de Paris Route de Saclay F-91128 Palaiseau France;

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  • 正文语种 eng
  • 中图分类 等离子体物理学;
  • 关键词

    capillary discharge; atomic nitrogen TALIF; nanosecond pulse discharge; high specific deposited energy; krypton calibration TALIF; N_2 dissociation;

    机译：毛细管放电;原子氮塔;纳秒脉冲放电;高特定的沉积能量;Krypton校准Talif;N_2解离;

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