Physics Department, Syracuse University, Syracuse, New York 13244, USA.
J Phys Chem A. 2010 Oct 7;114(39):10575-83. doi: 10.1021/jp104944y.
We study the interaction of atomic and molecular hydrogen with a surface of tholin, a man-made polymer considered to be an analogue of aerosol particles present in Titan's atmosphere, using thermal programmed desorption at low temperatures below 30 K. The results are fitted and analyzed using a fine-grained rate equation model that describes the diffusion, reaction, and desorption processes. We obtain the energy barriers for diffusion and desorption of atomic and molecular hydrogen. These barriers are found to be in the range of 30-60 meV, indicating that atom/molecule-surface interactions in this temperature range are dominated by weak adsorption forces. The implications of these results for the understanding of the atmospheric chemistry of Titan are discussed.
我们使用低温（低于 30 K）下的热程序脱附法研究了原子和分子氢与 tholin（一种被认为是泰坦大气中气溶胶颗粒的人工聚合物）表面的相互作用，使用细粒度速率方程模型对结果进行拟合和分析，该模型描述了扩散、反应和脱附过程。我们获得了原子和分子氢扩散和脱附的能垒。这些势垒的范围在 30-60 meV 之间，表明在这个温度范围内原子/分子-表面相互作用主要由弱吸附力控制。这些结果对理解泰坦大气化学的意义正在讨论中。
