气候变化领域集成服务门户(CCPortal): Titanium carbide nanocrystals in circumstellar environments

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DOI	10.1126/science.288.5464.313
	Titanium carbide nanocrystals in circumstellar environments
	Von Helden G.; Tielens A.G.G.M.; Van Heijnsbergen D.; Duncan M.A.; Hony S.; Waters L.B.F.M.; Meijer G.
发表日期	2000
ISSN	0036-8075
起始页码	313
结束页码	316
卷号	288 期号:5464
英文摘要	Meteorites contain micrometer-sized graphite grains with embedded titanium carbide grains. Although isotopic analysis identifies asymptotic giant branch stars as the birth sites of these grains, there is no direct observational identification of these grains in astronomical sources. We report that infrared wavelength spectra of gas-phase titanium carbide nanocrystals derived in the laboratory show a prominent feature at a wavelength of 20.1 micrometers, which compares well to a similar feature in observed spectra of postasymptotic giant branch stars. It is concluded that titanium carbide forms during a short (approximately 100 years) phase of catastrophic mass toss (>0.001 solar masses per year) in dying, low-mass stars.
英文关键词	graphite; isotope; nanoparticle; titanium carbide; isotopic analysis; meteorite; titanium; article; astronomy; crystal; gas; grain; infrared radiation; priority journal; solar energy; Astronomy; Cosmic Dust; Titanium
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/245880
作者单位	FOM Inst. Plasma Phys. Rijnhuizen, Edisonbaan 14, NL-3430 BE Nieuwegein, Netherlands; Dept. of Molecular and Laser Physics, University of Nijmegen, Toernooiveld 1, NL-6525 ED Nijmegen, Netherlands; SRON/Kapteyn Institute, University of Groningen, Landleven 12, NL-9700 AV Groningen, Netherlands; Department of Chemistry, University of Georgia, Athens, GA 30602, United States; Astronomical Institute, University of Amsterdam, Kruislaan 403, NL-1098 SJ Amsterdam, Netherlands; Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200B, 3001 B-Heverlee, Belgium
推荐引用方式 GB/T 7714	Von Helden G.,Tielens A.G.G.M.,Van Heijnsbergen D.,et al. Titanium carbide nanocrystals in circumstellar environments[J],2000,288(5464).
APA	Von Helden G..,Tielens A.G.G.M..,Van Heijnsbergen D..,Duncan M.A..,Hony S..,...&Meijer G..(2000).Titanium carbide nanocrystals in circumstellar environments.Science,288(5464).
MLA	Von Helden G.,et al."Titanium carbide nanocrystals in circumstellar environments".Science 288.5464(2000).