Advanced Nanocluster Ion Source Based on High-Power Impulse Magnetron Sputtering and Time-Resolved Measurements of Nanocluster Formation

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• 作者：Chuhang Zhang ; Hironori Tsunoyama ; Hiroki Akatsuka ; Hiroki Sekiya ; Tomomi Nagase ; Atsushi Nakajima
• 刊名：Journal of Physical Chemistry A
• 出版年：2013
• 出版时间：October 10, 2013
• 年：2013
• 卷：117
• 期：40
• 页码：10211-10217
• 全文大小：429K
• 年卷期：v.117,no.40(October 10, 2013)
• ISSN：1520-5215

文摘

We developed a new nanocluster (NC) ion source based on the high-power impulse magnetron sputtering (HiPIMS) technique coupled with a gas flow cell reactor. Silver NC anions (Ag_n^{鈥?/sup>) with a maximum intensity of 5.5 nA (Ag₁₁鈥?/sup>) are generated with the size ranging from the atomic anion to the 70-mer, which is well-controlled by simply adjusting the peak power and repetition rate of the HiPIMS. By time-resolved density profiles of Ag_n鈥?/sup>, we find that the ion beam generated by HiPIMS is characterized by individual 100 ms duration 鈥渂unches鈥?below a repetition rate of 10 Hz, which is well-thermalized with a group velocity of 5 m/s. The high intensity of the NCs is attributable to the high ionization fraction by this HiPIMS ion source, while the underlying mechanism of the flexible size tuning of the ion source is understood by time-resolved mass spectrometry coupled with the sequential growth mechanism; the increment of the density of the target species in the bunches with the peak power and the overlapping of the bunches with the repetition rate cause the formation of large NCs.}