论文标题
测量被困的亚mm颗粒的电偶极矩
Measuring Electric Dipole Moments of Trapped Sub-mm Particles
论文作者
论文摘要
我们提出了一种测量在（sub）-mm尺寸（玄武岩）颗粒中的电偶极矩中的方法，该粒子悬浮在声学陷阱中并以板电容器为中心。如果将电场应用于颗粒，则由于其永久偶极矩振荡了特定频率。我们在$ d_p = 10^{ - 15}的顺序上观察偶极矩... 10^{ - 14} \ rm \，c \，m $。偶极矩在小聚集体中随晶粒数量增加，对于捕获之前的样品（颤音）的样品较大。玄武岩谷物在测量过程中没有显示偶极矩的变化迹象，这意味着充电活动性的时间表至少大于分钟。
We present a method for measurements of electric dipole moments on (sub)-mm size (basalt) particles levitated in an acoustic trap and centered within a plate capacitor. If an electric field is applied the particles oscillate with specific frequencies due to their permanent dipole moments. We observe dipole moments on the order of $D_P = 10^{-15} ... 10^{-14} \rm \, C \, m $. The dipole moment increases in small aggregates with the number of grains and is larger for samples vibrated (tribocharged) before trapping. The basalt grains show no sign of change in their dipole moment during measurements, implying a timescale for charge mobility being at least larger than minutes.
