We investigated CO₂ splitting in recombining H₂ and He plasmas with ultralow electron temperatures between 0.1 and 0.4 eV. The conversion from CO₂ to CO and O₂ was observed in the ultralow-temperature plasmas. Since the rate coefficients of dissociation of CO₂ via electronic excited states are negligible at the ultralow electron temperature, the present experimental result gives us corroborative evidence of the CO₂ splitting via vibrational excited states. The rate coefficient of the CO₂ splitting, which was evaluated from the temporal variation of the CO₂ density, decreased clearly with the electron temperature. In addition, the rate coefficient observed in the ionizing H₂ 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 CO₂ splitting via vibrational excited states has a larger rate coefficient than that via electronic excited states.

我们研究了H ₂和He等离子体在0.1至0.4 eV之间的超低电子温度复合时的CO ₂分解。在超低温等离子体中观察到了从CO ₂到CO和O ₂的转化。由于在超低电子温度下，CO ₂通过电子激发态的解离速率系数可以忽略不计，因此本实验结果为我们提供了CO ₂通过振动激发态分裂的确证。的CO的速率系数₂分割，将其从CO的时间变化进行评价₂密度随电子温度明显降低。此外，在电离温度为2 eV的电离H ₂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。已经表明，通过振动激发态分裂的CO ₂具有比通过电子激发态分裂的CO ₂大的速率系数。