Rapid measurement of the net charge on nanoparticles in optical levitation system
APPLIED PHYSICS EXPRESS(2023)
摘要
Accurate measurement of the net charge on nanoparticles is critical in research and practical applications. We proposed a method for accurately measuring charge through thermally and harmonically driven motion signals. Our direct-charge-calculation method achieves accuracies of better than 5% at thermal equilibrium pressures of more than 10 mbar and approximately 20% for pressures as low as 3 mbar. This method can improve the measurement accuracy for mass and density through iterations and provide a direction for non-contact characterization of atmosphere and space dust.
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关键词
nanoparticles,net charge,optical
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