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Digitale Medien

High-dose phenomena in zinc-implanted silicon crystals (1996)

Simov, S. ; Kalitzova, M. ; Karpuzov, D. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 79 (1996), S. 3470-3476

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: The structure of (100) silicon implanted with Zn+ ions at an energy of 50 keV was studied. The ion doses were varied from 1×1015 to 1×1017 cm−2 and the beam current density was 10 μA cm−2. The analytical techniques employed for sample characterization included cross-sectional transmission electron microscopy and x-ray energy dispersion analysis. The energy deposition of the ion beam was calculated by using computer simulation codes. For the two lower doses of 1×1015 and 1×1016 a crystalline-to-amorphous transformation was observed in the implanted layer and this was correlated with the thermal history of the implants and the attendant changes in morphology. In contrast, an amorphous-to-crystalline transition was found to occur at higher doses, namely 5×1016 and 1×1017, where the formation of a complex, structured layer consisting of an amorphous phase mixed with crystalline grains of Zn and partly recrystallized Si was identified together with other specific structural features. Detailed characterization of the resulting microstructures was carried out taking into account the effects of sample heating, ion-beam-induced amorphization, crystallization, and sputtering. © 1996 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.361395

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Digitale Medien

Determination of the E,Z configuration of alkenephosphonates by the use of vicinal 13C—31P coupling constants (1985)

Spassov, S. L. ; Markova, L. ; Mondeshka, D. M. ; [weitere]

Chichester : Wiley-Blackwell

Organic Magnetic Resonance 23 (1985), S. 578-579

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ISSN: 0749-1581

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: The vicinal 13C—31P couplings in the C—C=C—P fragment of alkenephosphonates (∼8 Hz for a cis- and ∼22 Hz for a trans-orientation of the respective nuclei) are a reliable and convenient parameter for the determination of the EZ configuration of these and analogous compounds.

Zusätzliches Material: 1 Tab.