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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Gas-surface scattering dynamics of CO_2, NO_2, and O_3 in collisions with model organic surfaces
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Gas-surface scattering dynamics of CO_2, NO_2, and O_3 in collisions with model organic surfaces

机译：与模型有机表面碰撞时CO_2，NO_2和O_3的气体表面散射动力学

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High-energy (70 kJ/mol) molecular beams of CO_2, NO_2, and O_3 were scattered from long-chain methyl (CH_3-), hydroxyl (OH-), and perfluoro (CF_3(CF_2)_8 -, or F-) ω-functionalized alkanethiol self-assembled monolayers (SAMs) on gold to study the dynamics of energy exchange and thermal accommodation of atmospherically important triatomic molecules on model organic surfaces. Overall, the extent of energy transfer in gas collisions with all of the surfaces studied was substantial. Specifically, the triatomics scatter from each surface only after dissipating greater than 80% of their incident energy. Furthermore, although the OH-SAM is a more rigid surface, the extent of energy transfer and accommodation of these molecules to the CH_3 - and OH-SAMs were approximately the same. The similar scattering dynamics are likely due to significant gas-surface attractive forces between the triatomics and the OH terminal groups, which compensate for the rigidity of this monolayer. In contrast to the OH- and CH_3 -SAMs, the dominant pathway in collisions of the gases with the F-SAM was impulsive scattering. The portion of molecules that accommodated (<40%) to the F-SAM was about half of the amount that accommodated (～l70%) to the CH3- and OH-SAMs. Although differences in the surface properties had a significant effect on the dynamics, variances in the chemical and physical properties of the three gases, CO _2, NO_2, andO_3, were found to have little effect on the extent of energy transfer and accommodation for collisions with any one surface.
机译：高能（70 kJ / mol）的CO_2，NO_2和O_3分子束从长链甲基（CH_3-），羟基（OH-）和全氟（CF_3（CF_2）_8-或F-）散射金上的ω-官能化烷硫醇自组装单分子膜（SAMs），用于研究模型有机表面上大气上重要的三原子分子的能量交换和热适应动力学。总的来说，与所有研究表面发生气体碰撞时的能量转移程度是很大的。特别是，三原子仅在耗散了超过80％的入射能量后才从每个表面散射。此外，尽管OH-SAM表面更坚硬，但这些分子向CH_3-和OH-SAM的能量转移和容纳程度大致相同。类似的散射动力学可能是由于三原子分子与OH端基之间的巨大气体表面吸引力所致，这些吸引力补偿了该单分子层的刚性。与OH-和CH_3-SAMs相比，气体与F-SAM碰撞的主要途径是脉冲散射。 F-SAM中容纳（<40％）的分子部分约为CH3-和OH-SAM中容纳（约170％）的分子的一半。尽管表面性质的差异对动力学有显着影响，但发现三种气体（CO _2，NO_2和O_3）的化学和物理性质差异对能量传递的程度和与碰撞的适应性影响很小。任何一个表面。

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