Ablation plume structure and dynamics in ambient gas observed by laser-induced fluorescence imaging spectroscopy
宮部 昌文; 大場 正規; 飯村 秀紀; 赤岡 克昭; Khumaeni, A.*; 加藤 政明; 若井田 育夫
Miyabe, Masabumi; Oba, Masaki; Iimura, Hideki; Akaoka, Katsuaki; Khumaeni, A.*; Kato, Masaaki; Wakaida, Ikuo
The dynamic behavior of an ablation plume in ambient gas has been investigated by laser-induced fluorescence imaging spectroscopy. The second harmonic beam from an Nd:YAG laser (0.5-6J/cm$$^{2}$$) was focused on a sintered oxide pellet or a metal chip of gadolinium. The produced plume was subsequently intersected with a sheet-shaped UV beam from a dye laser so that time-resolved fluorescence images were acquired with an intensified CCD camera at various delay times. The obtained cross-sectional images of the plume indicate that the ablated ground state atoms and ions of gadolinium accumulate in a hemispherical contact layer between the plume and the ambient gas, and a cavity containing a smaller density of ablated species is formed near the center of the plume. At earlier expansion stage, another luminous component also expands in the cavity so that it coalesces into the hemispherical layer. The splitting and coalescence for atomic plume occur later than those for ionic plume. Furthermore, the hemispherical layer of neutral atoms appears later than that of ions; however, the locations of the layers are nearly identical. This coincidence of the appearance locations of the layers strongly suggests that the neutral atoms in the hemispherical layer are produced as a consequence of three-body recombination of ions through collisions with gas atoms. The obtained knowledge regarding plume expansion dynamics and detailed plume structure is useful for optimizing the experimental conditions for ablation-based spectroscopic analysis.
使用言語 : English
掲載資料名 : Spectrochimica Acta, Part B
: 110
ページ数 : p.101 - 117
発行年月 : 2015/08
出版社名 : Elsevier
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論文URL :
キーワード : レーザーアブレーション; レーザー誘起蛍光法; レーザー誘起プラズマ; 福島第一原子力発電所事故; Fukushima Daiichi Nuclear Power Station Accident
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登録番号 : AA20150183
抄録集掲載番号 : 43001202
論文投稿番号 : 16297
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