论文标题
在原行星磁盘的低压范围内碰撞充电
Collisional Charging in the Low Pressure Range of Protoplanetary Disks
论文作者
论文摘要
近年来，已经提出了碰撞充电来促进卵石在行星形成的早期阶段的生长。原行星磁盘中的环境压力范围从$ 10^{-9} $ MBAR到MBAR以外的范围。然而，仅在地球大气压，火星压力下进行碰撞充电的实验，并且迄今为止降至$ 10^{ - 2} $ MBAR。这项工作介绍了相同材料碰撞的首次压力收费测量，介于$ 10^{-8} $和$ 10^3 $ mbar之间。强烈的充电降至最低压力。详细说明，我们的观察结果表明，两个电极之间的崩溃电压的压力依赖性很强，我们建议分解还确定了原球磁盘中碰撞晶粒的最大电荷。我们得出的结论是，与行星形成相关的原星盘的所有部分都可能发生碰撞充电。
In recent years, collisional charging has been proposed to promote the growth of pebbles in early phases of planet formation. Ambient pressure in protoplanetary disks spans a wide range from below $10^{-9}$ mbar up to way beyond mbar. Yet, experiments on collisional charging of same material surfaces have only been conducted under Earth atmospheric pressure, Martian pressure and more generally down to $10^{-2}$ mbar thus far. This work presents first pressure dependent charge measurements of same material collisions between $10^{-8}$ and $10^3$ mbar. Strong charging occurs down to the lowest pressure. In detail, our observations show a strong similarity to the pressure dependence of the breakdown voltage between two electrodes and we suggest that breakdown also determines the maximum charge on colliding grains in protoplanetary disks. We conclude that collisional charging can occur in all parts of protoplanetary disks relevant for planet formation.
