Cluster-assisted generation of multi-charged ions in nanosecond laser ionization of pulsed hydrogen sulfide beam at 1064 and 532nm
Niu Dong-Mei (牛冬梅)ab, Li Hai-Yang (李海洋)a, Luo Xiao-Lin (罗晓琳)a, Liang Feng (梁峰)a, Cheng Shuang (程爽)ab, Li An-Lin (李安林)a
a Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China; b Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences,Hefei 230031, China
Abstract The multi-charged sulfur ions of Sq+ ($q\leq 6$) have been generated when hydrogen sulfide cluster beams are irradiated by a nanosecond laser of 1064 and 532,nm with an intensity of 1010 $\sim$1012W1$\cdot$cm-2. S6+ is the dominant multi-charged species at 1064nm, while S4+, S3+ and S2+ ions are the main multi-charged species at 532nm. A three-step model (i.e., multiphoton ionization triggering, inverse bremsstrahlung heating, electron collision ionizing) is proposed to explain the generation of these multi-charged ions at the laser intensity stated above. The high ionization level of the clusters and the increasing charge state of the ion products with increasing laser wavelength are supposed mainly due to the rate-limiting step, i.e., electron heating by absorption energy from the laser field via inverse bremsstrahlung, which is proportional to $\lambda^2$, $\lambda$ being the laser wavelength.
Received: 27 December 2005
Revised: 08 April 2006
Accepted manuscript online:
Fund: Project supported by the National Natural Science Foundation of China (Grant No 20573111) and
partly supported by the Center for Computational Science, Hefei Institutes of Physical Sciences, China (Grant No 0331405002).
Cite this article:
Niu Dong-Mei (牛冬梅), Li Hai-Yang (李海洋), Luo Xiao-Lin (罗晓琳), Liang Feng (梁峰), Cheng Shuang (程爽), Li An-Lin (李安林) Cluster-assisted generation of multi-charged ions in nanosecond laser ionization of pulsed hydrogen sulfide beam at 1064 and 532nm 2006 Chinese Physics 15 1511
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