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DOI	10.1126/science.272.5259.249
	Extraterrestrial helium trapped in fullerenes in the Sudbury impact structure
	Becker L.; Poreda R.J.; Bada J.L.
发表日期	1996
ISSN	0036-8075
起始页码	249
结束页码	252
卷号	272 期号:5259
英文摘要	Fullerenes (C60 and C70) in the Sudbury impact structure contain trapped helium with a 3HeX4He ratio of 5.5 × 10-4 to 5.9 × 10-4. The 3He/4He ratio exceeds the accepted solar wind value by 20 to 30 percent and is higher by an order of magnitude than the maximum reported mantle value. Terrestrial nuclear reactions or cosmic-ray bombardment are not sufficient to generate such a high ratio. The 3He/4He ratios in the Sudbury fullerenes are similar to those found in meteorites and in some interplanetary dust particles. The implication is that the helium within the C60 molecules at Sudbury is of extraterrestrial origin.
英文关键词	Atoms; Chemical bonds; Cosmic rays; Dust; Earth atmosphere; Fusion reactions; Helium; Meteorites; Molecular structure; Molecules; Particles (particulate matter); Toluene; Cosmic ray bombardment; Onaping formation; Solar wind value; Sudbury impact structure; Terrestrial nuclear reactions; Fullerenes; carbon; fullerene C60; fullerene C70; fullerene derivative; helium; article; astronomy; chemistry; NASA Center ARC; NASA Discipline Exobiology; NASA Discipline Number 52-70; NASA Discipline Number 93-10; NASA Program Exobiology; NASA Program NSCORT; Non-NASA Center; temperature; NASA Center ARC; NASA Discipline Exobiology; NASA Discipline Number 52-70; NASA Discipline Number 93-10; NASA Program Exobiology; NASA Program NSCORT; Non-NASA Center; Carbon; Fullerenes; Helium; Meteoroids; Temperature
语种	英语
来源期刊	Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/243001
作者单位	Space Science Division, Natl. Aero. Space Admin. Ames R., Moffett Field, CA 94035, United States; Scripps Institution of Oceanography, Univ. of California at San Diego, San Diego, CA 92093-0212, United States; Dept. of Earth and Environ. Sciences, University of Rochester, Rochester, NY 14627, United States
推荐引用方式 GB/T 7714	Becker L.,Poreda R.J.,Bada J.L.. Extraterrestrial helium trapped in fullerenes in the Sudbury impact structure[J],1996,272(5259).
APA	Becker L.,Poreda R.J.,&Bada J.L..(1996).Extraterrestrial helium trapped in fullerenes in the Sudbury impact structure.Science,272(5259).
MLA	Becker L.,et al."Extraterrestrial helium trapped in fullerenes in the Sudbury impact structure".Science 272.5259(1996).