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首页> 外文期刊>International journal of mass spectrometry >Afterglow studies of H_3~+(v=0) recombination using time resolved cw-diode laser cavity ring-down spectroscopy
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Afterglow studies of H_3~+(v=0) recombination using time resolved cw-diode laser cavity ring-down spectroscopy

机译:使用时间分辨CW二极管激光腔衰荡光谱研究H_3〜+(v = 0)重组的余辉

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摘要

The recombination of spectroscopically identified H_3~+(v=0) ions with thermal electrons has been studied in pulsed afterglow plasma by means of an infrared cavity ring-down spectrometer (CRDS). Time-resolved measurements of the H_3~+(v=0) density were carried out in helium buffer gas with small admixtures of argon and hydrogen. The gas temperature was ~330 K, and the total pressure ranged from 8 to 16 mbar. The CRDS signal on the υ_2=3←0 transition of H_3~+ (λ=1.4 μm) was monitored as a function of time during the discharge afterglow. Since the absorption cross-section is known, the decay of the H_3~+(v=0) number density and hence, the recombination coefficient can be deduced. At hydrogen number densities [H_2]=1*10~(14) to 8*10~(14) cm~(-3) the measured recombination rate coefficient was found to be α=(1.6±0.6)*10~(-7) cm~3 s~(-1).
机译:利用红外腔衰荡光谱仪(CRDS),在脉冲余辉等离子体中研究了光谱鉴定的H_3〜+(v = 0)离子与热电子的重组。 H_3〜+(v = 0)密度的时间分辨测量是在带有少量氩气和氢气的氦缓冲气体中进行的。气体温度为〜330 K,总压力为8到16 mbar。在放电余辉期间,H_3〜+(λ= 1.4μm)的υ_2= 3←0跃迁上的CRDS信号随时间而变。由于吸收截面是已知的,因此H_3〜+(v = 0)数密度的衰减,因此可以推导复合系数。在氢数密度[H_2] = 1 * 10〜(14)至8 * 10〜(14)cm〜(-3)时,测得的复合速率系数为α=(1.6±0.6)* 10〜(- 7)cm〜3秒〜(-1)。

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