Temperature-dependent kinetic analysis of cryogenic-specific reddish coloration synthesized with cryoplasma
Temperature-dependent kinetic analysis of cryogenic-specific reddish coloration synthesized with cryoplasma
复制标题
低温等离子体合成的低温特异性红色着色的温度依赖性动力学分析
DOI：
10.1016/j.icarus.2022.115152
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发表时间：
2022
期刊：
影响因子：
3.2
通讯作者：
and K.Terashima
中科院分区：
文献类型：
--
作者：
Y.Y. Phua;N.Sakakibara;T.Ito;and K.Terashima
我们最近报道了在低温等离子体辐照下CH 3OH/H2O冰的红色着色，这与外太阳系中一些冰冷天体上看到的红色表面相似，并且仅在低温下持续。在这项研究中，我们分析了在70-90 K的温度下照射这种冰的吸收光谱的时间演化，发现红色材料的标称生产率随着温度的升高而降低。我们进行了动力学分析，结果表明，虽然在500 nm处吸收的材料的形成没有显示出温度依赖性，但它们在低温等离子体照射下的消失显示出正的温度依赖性。这一发现表明，激发的等离子体物质与红色物质的相互作用，加上热驱动过程，可以增加红色物质的消失速率，甚至在低于其热分解温度的温度下也会导致它们的破坏，在我们以前的研究中发现，该温度为120-150 K。这些结果表明，辐射驱动的化学和热驱动的化学的影响一致可以影响红色材料的形成和稳定性，如在本研究中合成的那些。
We recently reported on the reddish coloration of a CH3OH/H2O ice irradiated by cryoplasma, which is similar in appearance to the reddish surfaces seen on some icy bodies in the outer Solar System, and is sustained only at cryogenic temperatures. In this study, we analyzed the time evolution of absorption spectra during irradiation of this ice at temperatures of 70–90 K, and found that the nominal production rates of the reddish materials decreased with increasing temperature. We conducted kinetic analysis, which revealed that although the formation of the materials that absorb at 500 nm showed no temperature dependence, their disappearance under cryoplasma irradiation showed a positive temperature dependence. This finding indicates that the interactions of excited plasma species with the reddish materials, coupled with thermally-driven processes, can increase the rates of disappearance of the reddish materials and result in their destruction even at temperatures below their thermal dissociation temperatures, which was found to be 120–150 K in our previous study. These results suggest that the effects of radiation-driven chemistry and thermally-driven chemistry in concert can influence the formation and stability of reddish materials such as those synthesized in this study.