Feng X, Bogan M J, Agnes G R
Department of Chemistry, Simon Fraser University Burnaby, BC, Canada.
Anal Chem. 2001 Sep 15;73(18):4499-507. doi: 10.1021/ac0101555.
An electrodynamic balance was used to levitate a single methanol droplet while it evaporated down to, and just beyond, its first encountered Coulomb fission limit as ascertained by the time dependence of its laser light scatter signal. At its Coulomb limit, the primary droplet fragmented and approximately 81% of its net charge was released in the form of small droplets that are termed progeny. The window of time over which the progeny droplets were ejected from the electrodynamic balance was deltat = 850 ms, indicating that these droplets were formed with a range of mass-to-charge values. An average of 13.2 (+/-4.4) progeny droplets were detected as a result of this fragmentation event. On the assumption that the average initial radius of the progeny droplets were one-tenth the radius of the droplet undergoing the Coulomb fission event, approximately 50% of the total net charge ejected would not have been carried by the 13 progeny droplets detected.
使用电动天平使单个甲醇液滴悬浮，同时使其蒸发至首次遇到的库仑裂变极限，并刚好超过该极限，这是通过其激光散射信号的时间依赖性确定的。在其库仑极限时，主液滴破碎，其净电荷的约81%以小液滴的形式释放，这些小液滴被称为子代。子代液滴从电动天平中喷出的时间窗口为Δt = 850毫秒，这表明这些液滴是在一系列质荷值下形成的。由于这次破碎事件，平均检测到13.2（±4.4）个子代液滴。假设子代液滴的平均初始半径是经历库仑裂变事件的液滴半径的十分之一，那么检测到的13个子代液滴不可能携带喷出的总净电荷的约50%。
