Rate coefficient of CO2 splitting in recombining H2 and He plasmas with ultralow electron temperatures

Rate coefficient of CO2 splitting in recombining H2 and He plasmas with ultralow electron temperatures
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超低电子温度下重组 H2 和 He 等离子体中 CO2 分裂的速率系数

DOI:
10.1088/1361-6595/aba722
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发表时间:
2020
影响因子:
3.8
通讯作者:
Sasaki Koichi
Sasaki Koichi
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Yamazaki Masahiro;Nishiyama Shusuke;Sasaki Koichi

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在0.1 ~ 0.4 eV的超低电子温度下,研究了h2和He等离子体重组过程中CO 2的分裂。在超低温等离子体中观察到co2向CO和o2的转化。由于在超低电子温度下,CO 2通过电子激发态解离的速率系数可以忽略不计,因此本实验结果为CO 2通过振动激发态分裂提供了确凿的证据。根据CO 2密度随时间的变化,CO 2的分裂速率系数随电子温度的升高而明显降低。此外,在电子温度为4 eV的电离h2等离子体中观察到的速率系数比在重组等离子体中观察到的速率系数小一个数量级。结果表明,co2通过振动激发态的分裂比通过电子激发态的分裂具有更大的速率系数。
We investigated CO 2 splitting in recombining H 2 and He plasmas with ultralow electron temperatures between 0.1 and 0.4 eV. The conversion from CO 2 to CO and O 2 was observed in the ultralow-temperature plasmas. Since the rate coefficients of dissociation of CO 2 via electronic excited states are negligible at the ultralow electron temperature, the present experimental result gives us corroborative evidence of the CO 2 splitting via vibrational excited states. The rate coefficient of the CO 2 splitting, which was evaluated from the temporal variation of the CO 2 density, decreased clearly with the electron temperature. In addition, the rate coefficient observed in the ionizing H 2 plasma with an electron temperature of 4 eV was one order of magnitude smaller than that observed in the recombining plasmas. It has been shown that the CO 2 splitting via vibrational excited states has a larger rate coefficient than that via electronic excited states.
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