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首页> 外文期刊>The Journal of Chemical Physics >The interaction of hyperthermal nitrogen with N-covered Ag(111)
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The interaction of hyperthermal nitrogen with N-covered Ag(111)

机译：高温氮与氮覆盖的银的相互作用（111）

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摘要

A mixed beam of hyperthermal N atoms and N_2 molecules was scattered from the N-covered Ag(111) surface held at 300 K. The angular distribution of scattered N atoms is very broad. In contrast, N_2 molecules exhibit a sharp angular distribution. Taking into account the relative mass ratio, N loses more energy at the surface than N_2. In terms of energy loss, the atoms approximately follow the binary collision model while the molecules do not. Instead, the energy curves of scattered N_2 are more comparable to the parallel momentum conservation model for near specular outgoing angles (40-65). For both atoms and molecules the angle-resolved intensity and final energy curves are very similar to those from the bare surface. However, the N-covered surface yields non-negligible N_2 intensity for a broad range of outgoing angles, including along the surface normal. This was not the case from the clean surface, where the measured intensity distribution was confined to the narrower angular range indicated above. Backscattering and direct abstraction reactions are evaluated as possible origins of this additional N_2 signal. Of these, an abstraction mechanism appears to be the most consistent with the measured data.
机译：从保持在300 K的N覆盖的Ag（111）表面上散射了一个高温N原子和N_2分子的混合束。散射的N原子的角度分布非常宽。相反，N_2分子表现出尖锐的角度分布。考虑到相对质量比，N在表面损失的能量大于N_2。就能量损失而言，原子近似遵循二元碰撞模型，而分子则不遵循。相反，对于近镜面出射角（40-65），散射的N_2的能量曲线与平行动量守恒模型更具可比性。对于原子和分子，其角度分辨强度和最终能量曲线都与裸露表面的相似。但是，对于大范围的出射角（包括沿表面法线），N覆盖的表面会产生不可忽略的N_2强度。从清洁的表面不是这种情况，在清洁的表面上，测得的强度分布被限制在上述较窄的角度范围内。反向散射和直接抽象反应被评估为该附加N_2信号的可能来源。其中，抽象机制似乎与测量数据最一致。

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