Collision induced migration of adsorbates on surfaces
Collision induced migration of adsorbates on surfaces
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碰撞引起吸附物在表面上的迁移
DOI：
10.1063/1.479038
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发表时间：
1999
影响因子：
4.4
通讯作者：
Y. Zeiri
中科院分区：
文献类型：
--
作者：
L. Romm;M. Asscher;Y. Zeiri
碰撞诱导迁移（CIM）已被确定为一种新的表面现象，并已首次使用分子动力学模拟进行了研究。CIM过程由高能气相氩原子撞击Ru（001）上吸附的氮分子表示。研究了CIM效率随对撞机初始动能和入射角的变化规律。结果发现，在低覆盖率的吸附分子可以迁移超过150以下的碰撞在高能量和掠入射角。随着覆盖率的增加，吸附物间的碰撞导致迁移距离的显着减少。在高能量下，碰撞诱导解吸的竞争过程成为主导，留下迁移距离较短的分子。这些竞争信道导致冲突能量，对于该冲突能量，CIM被最大化。对于N2/Ru系统，CIM过程是最有效的碰撞机附近的能量为2.0 eV。这一新的CIM表面现象必须加以研究。
Collision induced migration (CIM) has been identified as a new surface phenomenon and has been studied for the first time using molecular dynamics simulations. The CIM process was represented by an energetic gas phase argon atom, striking an adsorbed nitrogen molecule on Ru(001). The efficiency of CIM was investigated as a function of the collider initial kinetic energy and angle of incidence. It was found that at low coverages an adsorbed molecule can migrate more than 150 A following collisions at high energies and grazing angles of incidence. As coverage increases, inter-adsorbate collisions result in significant reduction of migration distances. At high energies, the competing process of collision induced desorption becomes dominant, leaving behind molecules which migrate shorter distances. These competing channels lead to a collision energy for which CIM is maximized. For the N2/Ru system, the CIM process is most effective near collider energy of 2.0 eV. This new surface phenomenon of CIM has to be c...