Nobelpreis 1989: Felder, Phasen, Fallen … Atome, Ionen und Elektronen, genau betrachtet

Toschek, P. E.

doi:10.1002/phbl.19890451204

Cited by 5 publications

(1 citation statement)

References 53 publications

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“…2X r, -r& (2) In the outside region, however, there remains an eR'ective binding force. The classical equations of motion which recently were found in alkali-metal clusters [22].…”

Section: Mqlecular Dynamicsmentioning

confidence: 99%

Structure and Madelung energy of spherical Coulomb crystals

Hasse¹,

Avilov

1991

Phys. Rev. A

112

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With the help of molecular-dynamics computer simulations, we study the equilibrium con6gurations of systems of N =2 -5000 strongly correlated charged particles under the influence of a radial harmonic external confining force and their mutual Coulomb forces. The temperature is well below the crystallization point; i.e. , the ratio of Coulomb to kinetic energy is as large as 1 = 10 . The particles arrange in concentric spherical shells with approximately constant intershell distances. On the surfaces plane hexagonal structures are well pronounced. The calculated radii, occupation numbers, and energies per particle are compared with results of classical geometrical and shell models with homogeneously charged shells corrected for hexagonal surface occupation. The closed-shell particle numbers also agree well with those of multilayer icosahedra. From the computer simulations we extract a Madelung (excess) energy of -0.8926, which is close to the theoretical value of the shell model corrected for plane hexagonal surfaces, -0.8923, but larger than the one of the infinite geometrical lattice, -0.8944, and of the bcc value of -0.8959. Surface-energy eÃects are positive and of the order of N PACS number(s): 32.80. Pj, 52.25.b, 52.65.+z, 52.75.Di

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“…2X r, -r& (2) In the outside region, however, there remains an eR'ective binding force. The classical equations of motion which recently were found in alkali-metal clusters [22].…”

Section: Mqlecular Dynamicsmentioning

confidence: 99%

Structure and Madelung energy of spherical Coulomb crystals

Hasse¹,

Avilov

1991

Phys. Rev. A

112

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Das Einzelion — Quantenpräparat und Idealuhr

Toschek¹

1990

Phys. Bl.

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213Peter Ernst Toschek (links) nimmt den Robert Wichard Pohl-Preis 1990 aus der Hand von DPG-Prdsident Folberth entgegen. Toscheks erster akademischer Lehrer war Robert Wichard Pohl -sein letzter Lehrer und Doktorvater war Wolfgang Paul, Trager des Pohl-Preises 1989. Ein einzelnes Ion, gespeichert in einer .Jonenfalle", ist ein mikrophysikalisches Priiparat: Es erlaubt die fast beliebige Wiederholung seiner Beobachtung und erhalt damit Individualitat. Wiederholte identische Praparation des Ionenzustands ermoglicht die Prufung quantenmechanischer Aussagen an Einzelteilchen. Reproduzierbarkeit und die Freiheit von aufJeren Storungen legen nahe, gespeicherte Einzelionen als Frequenznormale und damit als Primdruhren einzusetzen.

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