Mo Jianyong, Simha Akarsh, Kheifets Simon, Raizen Mark G
Opt Express. 2015 Jan 26;23(2):1888-93. doi: 10.1364/OE.23.001888.
We report on shot-noise limited measurements of the instantaneous velocity distribution of a Brownian particle. Our system consists of a single micron-sized glass sphere held in an optical tweezer in a liquid in equilibrium at room temperature. We provide a direct verification of a modified Maxwell-Boltzmann velocity distribution and modified energy equipartition theorem that account for the kinetic energy of the liquid displaced by the particle. Our measurements confirm the distribution over a dynamic range of more than six orders of magnitude in count-rate and five standard deviations in velocity.
我们报告了对布朗粒子瞬时速 度分布的散粒噪声限制测量。我们的系统由一个微米级的玻璃球体组成，该球体被置于室温下处于平衡态的液体中的光镊中。我们直接验证了修正的麦克斯韦 - 玻尔兹曼速度分布和修正的能量均分定理，该定理考虑了被粒子排开的液体的动能。我们的测量在计数率超过六个数量级和速度五个标准差的动态范围内证实了该分布。
