This paper presents quantitative measurements of the N 2 Gladstone–Dale constant and scalar polarizability in non-equilibrium conditions, created by a nanosecond pulsed discharge at a pressure of 90 Torr. Optical path differences and spatially varying refractive index profiles are obtained by temporally-resolved Mach–Zehnder interferometry. Spontaneous Raman scattering spectroscopy is used to investigate the highly non-equilibrium vibrational population and to measure the N 2 ( ##IMG## [http://ej.iop.org/images/0022-3727/53/48/485203/dabae95ieqn1.gif] {${{\text{X}}^1}{{\Sigma }}_g^ + $} ) vibrational temperature and rotational temperature in the discharge afterglow region. The local gas density is inferred from the rotational temperature with isobaric conditions at long time delays ranging from 10 to 500 µ s after initiating the pulsed discharge. The non-equilibrium effects on the N 2 Gladstone–Dale constant and scalar polar...

中文翻译：

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通过Mach-Zehnder干涉和自发拉曼散射测量脉冲纳秒级非平衡放电中N 2的折射率和标量极化率

本文介绍了在90托压力下通过纳秒脉冲放电产生的非平衡条件下N 2 Gladstone–Dale常数和标量极化率的定量测量。光程差和空间变化的折射率分布是通过时间分辨的马赫曾德尔干涉仪获得的。自发拉曼散射光谱用于研究高度非平衡的振动种群并测量N 2（## IMG ## [http://ej.iop.org/images/0022-3727/53/48/485203/ dabae95ieqn1.gif] {$ {{\ text {X}} ^ 1} {{\ Sigma}} _ g ^ + $}）在放电余辉区域的振动温度和旋转温度。从等温条件下的旋转温度出发，在脉冲放电开始后的10到500 µs的长时间延迟内可以推断出局部气体密度。