亚微米粒子电偶极矩的测量
Measuring Electric Dipole Moments of Trapped Sub-mm Particles
摘要：
我们提出了一种方法用于测量电偶极矩（分）毫米大小（玄武岩）颗粒悬浮在声阱和平板电容器内的中心。如果施加电场，则粒子由于其永久偶极矩而以特定频率振荡。我们观察到的偶极矩的顺序为$D_P = 10^{-15} ... 10^{-14} \rm \, C \, m $。的偶极矩增加，在小聚集体的颗粒的数量和较大的样品振动（tribocharged）之前捕获。玄武岩颗粒在测量过程中没有显示出它们的偶极矩变化的迹象，这意味着电荷迁移率的时间尺度至少大于分钟。
英文摘要：
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.
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