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The determination of shadowing critical angles in impact collision ion scattering spectroscopy (1988)

Fauster, Th. ; Hartwig, D. ; Dürr, H.

Springer

Applied physics 45 (1988), S. 63-67

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ISSN: 1432-0630

Keywords: 79.20.Nc ; 79.20.Rf

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Notes: Abstract Critical angles for shadowing in low-energy ion scattering spectroscopy are calculated in the momentum approximation for the Thomas-Fermi-Molière potential and the Ziegler-Biersack-Littmark potential. In the relevant parameter range the results can be fitted by a formula containing five constants depending on the potential only. For a fixed projectile-target combination at a given energy the distance dependence of the critical angle is described by a simple power law. The comparison of the calculated results with experimental data shows that the inclusion of the effect of thermal vibrations on the critical angles improves the agreement between calculations and experiment significantly.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00618764

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13C NMR spectra of aryl-substituted spirocyclopropanesDedicated to Professor D. Schulte-Frohlinde on his 60th birthday. (1985)

Abdel-Wahab, A. ; Doss, S. H. ; Dürr, H. ; [et al.]

Chichester : Wiley-Blackwell

Organic Magnetic Resonance 23 (1985), S. 744-747

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ISSN: 0749-1581

Keywords: Chemistry ; Analytical Chemistry and Spectroscopy

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: The 13C NMR spectra of 2-arylspiro[cyclopropane-1,9′-thioxanthene S,S-dioxides], 1-5, and 2′-aryl-spiro[10,11-dihydro-5H-dibenzo[a,d]cycloheptene-5,1′-cycyclopropanes], 6-9, are described, and the effects of substituents are discussed. The relationship between the 13C shifts and the Hammett σ constants of substituents on the phenyl ring is not linear for 1-5. For 6-9 the chemical shifts of the cyclopropane carbons (C-2′ and C-3′) correlate reasonably well with electron density.

Additional Material: 2 Ill.