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- Material Type
- 規格・テクニカルリポート類
- Author/Editor
- 柴田 猛順小倉 浩一
- Publication Date
- 2009-03
- Publication Date (W3CDTF)
- 2009
- Alternative Title
- Population distribution of metastable states of neodymium atoms produced by electron beam heating
- Periodical title
- JAEA-Research 2008-124
- Target Audience
- 一般
- Note (General)
- 出版タイプ： NA電子ビーム加熱蒸発で生成したネオジム原子ビームの準安定準位分布をレーザー誘起蛍光法で測定した。測定した準安定準位分布より求めた原子励起温度は、推定蒸発面温度(2000K)より低く、蒸発量を増加させるとともに1500K程度まで低下することがわかった。電子ビーム加熱蒸発で同様に生成したガドリニウム原子の場合、原子励起温度が500Kまで低下するのと比較すると、ネオジム原子はガドリニウム原子に比べて原子励起温度が高く緩和しにくい。ネオジム原子もガドリニウム原子も蒸発面近傍での原子間衝突で超微細構造間の遷移を引き起こし緩和が進む。ガドリニウム原子は4f$^{7}$5d6s$^{2}$で軌道半径が比較的大きい5d電子をもっているが、ネオジム原子は4f$^{4}$6s$^{2}$で5d電子がない。このため、ネオジム原子は原子間衝突で緩和しにくく原子励起温度がガドリニウムに比べ非常に高いと考察した。The metastable states' population of neodymium atoms produced by electron beam heating was measured with the laser induced fluorescence method. The atomic excitation temperature derived from the metastable state distribution decreased to about 1500K with increasing deposition rate. This atomic excitation temperature is about three times higher than that of gadolinium atoms produced by electron beam heating. Near the evaporation surface the collisional relaxation of neodymium and gadolinium atoms occurs through inelastic collisions between fine structures. The gadolinium and neodymium atoms have ten valence electrons of 4f$^{7}$5d6s$^{2}$ and six valence electrons of 4f$^{4}$6s$^{2}$, respectively. The orbital radius of 5d electron is relatively larger than that of 4f electron. Low collisional relaxation of neodymium is considered to be due to small orbital radius of 4f electron and no existence of 5d electron.
- Source
- /JAEA-Research-2008-124.pdf （fulltext）