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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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Supramolecular effects on photochromism - properties of crown ether-modified dihydroindolizinesDedicated to Professor H. G. O. Becker on the occasion of his 70th birthday. (1992)

Dürr, H. ; Thome, A. ; Kranz, C. ; [et al.]

Chichester : Wiley-Blackwell

Journal of Physical Organic Chemistry 5 (1992), S. 689-698

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ISSN: 0894-3230

Keywords: Organic Chemistry ; Physical Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Physics

Notes: Photochromic molecules such as dihydroindolizines (DHI) containing crown ether units can be ‘tuned’, as far as their properties are concerned, by supramolecular ion binding. Inclusion of the ion in the crown ether cavity yields a new supramolecular species. This species shows special properties of the excited state after guest addition: (a) bathochromic shifts of the photochromic crown ethers and also hyperchromic effects in the UV spectra; (b) fluorescence intensity of one of the photochromic crown ethers is either increased (crown excitation) or decreased (DHI excitation) after addition of alkali metal ions; and (c) in the ground state a large change in reaction rate for the reaction 1,5-electrocyclization betaine (coloured form) to dihydroindolizine is observed in the supramolecular complexes.

Additional Material: 5 Ill.