分光学的アプローチによる地球・惑星炭素質物質の物性と起源に関する研究

• 鍵 裕之

  東京大学大学院理学系研究科附属地殻化学実験施設

書誌事項

タイトル別名

• Spectroscopic properties of natural carbon-related materials and implication to geochemistry
• ブンコウガクテキ アプローチ ニ ヨル チキュウ ワクセイ タンソシツ ブッシツ ノ ブッセイ ト キゲン ニ カンスル ケンキュウ

抄録

This paper reviews three topics on the spectroscopic approach to the natural carbonaceous materials, especially focuses on photoluminescence (PL) spectroscopy of natural polycrystalline diamonds and Raman spectra deciphering chemical structure of graphite. The first topic is characteristic PL spectra of carbonado natural polycrystalline diamond whose origin has been in enigma. We have shown that carbonado from Central African Republic can be grouped into two groups according to the structure of PL spectra. PL of carbonado resulted from radiation-induced damage and interaction with thermal fluids. Carbon isotope composition, thermal behavior, REE abundance correlate with PL. We suggested that the characteristics of carbonado were induced at the last stage by reaction with thermal fluids. The second is micro Raman spectroscopy characterizing the chemical structure of graphitic material in ureilite. We proposed array plots between Raman frequency of E_2g mode of graphite and intensity ratio of G-band to D-band. The distribution in the array plots was proved to be closely linked to the extent of shock which ureilites suffered. The third is on the technical caution on micro-Raman spectroscopy. Laser-induced heating during measurements of micro-Raman spectra, in some cases, gives rise to considering downshifts in Raman spectra of powder samples. We showed that the intensity ratio of Stokes line to Anti-Stokes line is potential to monitor the temperature of sample surface to cancel out the artificial downshifts. Furthermore, we demonstrated that the stacking sequences of graphite did not affect the intralayer vibrational frequency.

収録刊行物

• 地球化学

  地球化学 34 (3), 169-189, 2000

  一般社団法人日本地球化学会

キーワード

• diamond
• graphite
• Raman spectroscopy
• photoluminescence
• radiation damage
• carbonado
• ureilite

詳細情報

• CRID: 1390001205740782976
• NII論文ID: 110008680006
• NII書誌ID: AN00141280
• DOI: 10.14934/chikyukagaku.34.169
• ISSN: 21885923
• ISSN: 03864073
• NDL書誌ID: 5453311
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I5453311
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可