Liu Bin, Avinash K, Goree J
Department of Physics and Astronomy, The University of Iowa, Iowa City, Iowa 52242, USA.
Phys Rev E Stat Nonlin Soft Matter Phys. 2004 Mar;69(3 Pt 2):036410. doi: 10.1103/PhysRevE.69.036410. Epub 2004 Mar 31.
A procedure was developed to characterize the interparticle potential in a lattice that is confined by an external potential. The first of the two steps is to characterize the confining potential, which can be done using various schemes involving observations of particle motion. The second step is to characterize the interparticle potential using measurements of the equilibrium particle positions. This can be done with either of two methods developed here, a force-balance method or a simpler equation-of-state method. To demonstrate and test these methods, an experiment and a molecular dynamics simulation were performed with a one-dimensional Coulomb chain of particles confined in a parabolic potential. The experiment used a dusty plasma consisting of charged microspheres levitated in the plasma sheath above a narrow groove in a lower electrode.
开发了一种程序来表征由外部势限制的晶格中的粒子间势。两个步骤中的第一步是表征限制势，这可以使用涉及观察粒子运动的各种方案来完成。第二步是使用平衡粒子位置的测量来表征粒子间势。这可以通过这里开发的两种方法中的任何一种来完成，一种是力平衡方法，另一种是更简单的状态方程方法。为了演示和测试这些方法，对限制在抛物线势中的一维库仑粒子链进行了实验和分子动力学模拟。该实验使用了一种尘埃等离子体，它由悬浮在下部电极中窄槽上方等离子体鞘层中的带电微球组成。
