Amorphization in zircon: evidence for direct impact damage
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چکیده
منابع مشابه
Alpha-decay damage and recrystallization in zircon: evidence for an intermediate state from infrared spectroscopy
α-decay damage and recrystallization in natural zircon (with dose ranging from 0.06 to 23.3 × 1018 α-events g−1) were studied using polarized reflection infrared spectroscopy. The experimental results show that α-decay damage leads to a gradual decrease in reflectivity and a loss of anisotropy of IR spectra. Recrystallization of damaged zircon is found as a multi-stage process with a strong dep...
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Introduction: The impact history of the solar system remains controversial. Early investigation of lunar samples, returned by Apollo astronauts, led to the 'Late Heavy Bombardment' (LHB) concept [1,2] which hypothesized a sharp increase in bolide flux centered around ~3.9 Ga. Evidence for this cataclysm was first derived from whole-rock U-Pb and Rb-Sr ages [2] but subsequently more on 40 Ar-39 ...
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The ability of tirapazamine (1, 3-amino-1,2,4-benzotriazine 1, 4-dioxide, SR4233) to fix DNA radical lesions is demonstrated by studying the reaction between the antitumor drug and an oligonucleotide radical that is independently produced at a defined site within a biopolymer. Using beta-mercaptoethanol as a competitor, it was determined that tirapazamine traps a C1'-nucleotide radical with a r...
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متن کاملSynergy between thermal spike and exciton decay mechanisms for ion damage and amorphization by electronic excitation
F. Agulló-López,1,2,* A. Mendez,1,2 G. García,1,† J. Olivares,3,1 and J. M. Cabrera2 1Centro de Microanálisis de Materiales (CMAM), Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain 2Departamento de Física de Materiales, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain 3Instituto de Óptica “Daza de Valdés,” CSIC, 28004 Madrid, Spain Received 9 August 2006; publish...
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ژورنال
عنوان ژورنال: Journal of Physics: Condensed Matter
سال: 2000
ISSN: 0953-8984,1361-648X
DOI: 10.1088/0953-8984/12/11/306