Studies of ion energy and yield from
argon clusters heated by intense femtosecond laser pulses |
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Authors: | S H Li C Wang J S Liu X X Wang R X Li G Q Ni Z Z Xu |
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Institution: | (1) Department of Physics, Shantou University, Shantou, 515063, P.R. China;(2) Laboratory for High Intensity Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, P.R. China |
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Abstract: | Using time-of-flight spectrometry, the interaction of intense femtosecond
laser pulses with argon clusters has been studied by measuring the energy
and yield of emitted ions. With two different supersonic nozzles, the
dependence of average ion energy
on cluster size
in a large range of
has been measured. The experimental results indicate that
when the cluster size
, the average ion
energy
Coulomb explosion is the
dominant expansion mechanism. Beyond this size, the average ion energy gets
saturated gradually, the clusters exhibit a mixed Coulomb-hydrodynamic
expansion behavior. We also find that with the increasing gas backing
pressure, there is a maximum ion yield, the ion yield decreases as the gas
backing pressure is further increased. |
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Keywords: | |
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