A transient spark micro-discharge in nitrogen is investigated between two sharpened electrodes at a pressure of 0.5 bar. The plasma parameters (gas temperature, electron density and reduced electric field) are determined using optical emission spectroscopy (OES) and numerical simulations. The gas temperature of 3500 ± 100 K is determined by the comparison of the measured and simulated rotational distributions of the photoemission spectra of neutral molecular nitrogen N 2 (C-B,0–0). Both direct and stepwise electron impact excitation are considered in the collision-radiative model. The rate constants for electron impact excitation processes are calculated for different electric field values using the electron velocity distribution function, which is simulated by solving the Boltzmann equation. The applied broadband echelle spectrometer is absolutely calibrated in a spectral range of 200 nm to 800 nm, using two standard light sources, a deuterium lamp and a tungsten ribbo...

中文翻译：

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使用同时双波长诊断技术表征氮气中的瞬态火花微放电

在压力为0.5 bar的两个尖锐电极之间研究了氮气中的瞬态火花微放电。等离子体参数（气体温度，电子密度和减少的电场）使用光学发射光谱（OES）和数值模拟确定。通过比较中性分子氮N 2（CB，0-0）的光发射光谱的实测和模拟旋转分布，确定3500±100 K的气体温度。在碰撞辐射模型中考虑了直接和逐步电子冲击激发。电子碰撞激发过程的速率常数是使用电子速度分布函数针对不同的电场值计算得出的，该函数通过求解玻耳兹曼方程进行模拟。