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首页> 外文期刊>The Journal of Chemical Physics >Collisional energy loss in cluster surface impact: Experimental, model, and simulation studies of some relevant factors
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Collisional energy loss in cluster surface impact: Experimental, model, and simulation studies of some relevant factors

机译：团簇表面碰撞的碰撞能量损失：一些相关因素的实验，模型和模拟研究

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Measurements of the collisional energy transfer of size and energy-selected ammonia cluster ions (NH3)(n)H+, n = 1 - 10, impacting a silicon wafer coated with p-type diamond film are reported. The transfer from translational energy of the incident cluster ions to kinetic energy of intact scattered cluster ions has been studied as a function of impact energy, surface composition, and size of the impinging cluster cations. For low impact energies (< 2.5 eV/molecule), cluster ions scattered off the target surface lost most of their initial kinetic energy, while for higher impact energies the elasticity of the cluster-surface collision is surprisingly high: Typically 75% of the impact kinetic energy is retained by the scattered parent clusters. Larger cluster ions are scattered less elastically and a large fraction of them shatter to small(est) fragments. The molecular dynamics simulations examine the two energy disposal regimes, deep inelasticity and shattering. Deep inelastic scattering occurs already below the lowest impact energies probed by the experiment. At higher collision energies, the energy loss continues to increase but a point is reached where most clusters shatter. Those few clusters that rebound intact have lost a disproportionately low fraction of their initial energy. The simulations also explore the cluster size effects, the role of the attraction to the surface, and the importance of the anisotropic forces between the molecules in the cluster. The experimental results and the simulations are discussed using the hard cube model with special reference to collective effects. (C) 1998 American Institute of Physics. [References: 53]
机译：报告了碰撞尺寸和能量选择的氨团簇离子（NH3）（n）H +，n = 1-10的碰撞能量转移的测量结果，该碰撞会影响涂有p型金刚石薄膜的硅片。已经研究了从入射簇离子的平移能到完整的散射簇离子的动能的转移，它是冲击能，表面组成和撞击簇阳离子的大小的函数。对于低冲击能量（<2.5 eV /分子），从目标表面散射的簇离子损失了大部分初始动能，而对于更高的冲击能量，簇表面碰撞的弹性却高得惊人：通常为75％动能被分散的母簇保留。较大的簇离子被较少弹性地散射，并且其中很大一部分破碎成最小的（最小）碎片。分子动力学模拟检查了两种能量处置方式，深层非弹性和破碎。已经在实验探测到的最低冲击能量以下发生了深层的非弹性散射。在较高的碰撞能量下，能量损失继续增加，但达到了大多数团簇破碎的程度。那些完整反弹的少数簇失去了其初始能量的极低比例。该模拟还探讨了簇的大小效应，表面吸引作用以及簇中分子之间各向异性力的重要性。使用硬立方体模型讨论了实验结果和仿真，并特别提到了集体效应。 （C）1998美国物理研究所。 [参考：53]

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