| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2014: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Outline of Final Research Achievements |
Preparation of sodium vapors was investigated for the spectroscopy of sodium vapors in the vacuum ultraviolet (VUV) by use of laser ablation. Delay time behaviors of absorption by sodium D lines in the visible spectral region indicated that the absorption started at approximately 400 ns and it had a peak at 1000 ns of delay time at 1 mm from a sodium target. A model describing the plasma plume expansion of sodium reproduced the experimental delay time behaviors. As a result, the peak value of neutral sodium number density was evaluated on the order of 1e17 cm-3, which may be high enough to carry on the VUV spectroscopy of sodium.
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