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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Ultra-high-resolution optical absorption spectroscopy of DC plasmas at low pressure using a supercontinuum laser combined with a laser line tunable filter and a HyperFine spectrometer
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Ultra-high-resolution optical absorption spectroscopy of DC plasmas at low pressure using a supercontinuum laser combined with a laser line tunable filter and a HyperFine spectrometer

机译：使用超强素激光器与激光线可调滤波器和高血清光谱仪在低压下直流等离子体的超高分辨率光学吸收光谱。

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Optical absorption spectroscopy of non-equilibrium plasmas using a supercontinuum laser combined with a laser line tunable filter and a HyperFine spectrometer is examined. Owing to the <2 pm spectral resolution of the HyperFine system, details on the absorption line intensity, position and width can be obtained with very high precision using a broadband light emission source. As an example, absorption spectroscopy measurements were recorded in a reduced-pressure, nominally pure argon DC plasma column and allowed for the determination of the neutral gas temperature and the Ar 1s(2) and Ar 1s(4) (Paschen notation) number densities. At a pressure of 1 Torr, a discharge current of 20 mA, and an absorption length of 18 cm, the analysis of the Ar 2p(3)-1s(2) and Ar 2p(8)-1s(4) absorption lines at respectively 840.8 nm and 842.5 nm resulted in number densities of n(1s2) = 5.5 x 10(15) m(-3) and n(1s4) = 1.1 x 10(16) m(-3) and a netural gas temperature of T-g = 340 K. These values are typical of DC discharges operated under similar experimental conditions. While the fractional absorption of both lines decreased with decreasing optical absorption path, the number densities remained the same, as expected. Finally, the number densities increased with increasing discharge current, a result also coherent with the literature.
机译：利用超连续谱激光器、激光线可调谐滤波器和超精细光谱仪对非平衡等离子体的光学吸收光谱进行了研究。由于超精细系统的光谱分辨率小于2 pm，使用宽带光源可以非常高精度地获得吸收线强度、位置和宽度的细节。例如，在减压、名义上纯氩直流等离子体柱中记录吸收光谱测量，并允许测定中性气体温度和Ar 1s（2）和Ar 1s（4）（Paschen符号）数密度。在1托的压力、20毫安的放电电流和18厘米的吸收长度下，分别在840.8 nm和842.5 nm处对Ar 2p（3）-1s（2）和Ar 2p（8）-1s（4）吸收线进行分析，得出n（1s2）=5.5 x 10（15）m（-3）和n（1s4）=1.1 x 10（16）m（-3）的数密度，以及T-g=340 K的自然气体温度。这些值是在类似实验条件下运行的典型直流放电。虽然两条线的部分吸收随着光吸收路径的减小而减小，但数密度保持不变，如预期的那样。最后，数密度随着放电电流的增加而增加，这一结果也与文献一致。

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