Imaging the translational dynamics of CF3 in liquid helium droplets.
Imaging the translational dynamics of CF3 in liquid helium droplets.
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对液氦液滴中 CF3 的平移动力学进行成像。
DOI：
10.1103/physrevlett.93.253401
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发表时间：
2004
影响因子：
8.6
通讯作者：
M. Drabbels
中科院分区：
文献类型：
--
作者：
A. Braun;M. Drabbels
通过光解溶解在由数千个原子组成的氦液滴中的 CF3I，研究了 CF3 在液氦中的平移动力学。使用离子成像技术确定了从液滴中逸出的 CF3 碎片的速度分布，并发现相对于气相 CF3I 的光解离，其速度明显转向较低的速度。此外，碎片还显示出与速度相关的角分布，对于最慢的碎片来说是各向同性的，对于较快的碎片来说则接近气相分布。这些分布指向非热逃逸过程，其中，至少对于与本实验相关的速度，从碎片到溶剂的动能和动量转移似乎是由与单个氦原子的二元碰撞控制的。
The translational dynamics of CF3 in liquid helium have been investigated by photodissociating CF3I dissolved in helium droplets consisting of several thousands of atoms. The velocity distribution of CF3 fragments that have escaped from the droplets has been determined using ion imaging techniques and is found to be considerably shifted to lower speeds with respect to the photodissociation of gas phase CF3I. The fragments furthermore show a speed dependent angular distribution that is isotropic for the slowest and approaches the gas phase distribution for the faster fragments. These distributions point to a nonthermal escape process in which, at least for the speeds relevant for the present experiment, the kinetic energy and momentum transfer from the fragments to the solvent appears to be governed by binary collisions with the individual helium atoms.