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Technische Universität München Arcisstr. 19 80333 München, Germany http://www.tum.de
Contact Mr Prof. Peter Feulner +49 89 28912607
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Technische Universität München

Photoelektronen im Gleichtakt

Zeitlicher Ablauf des Photoeffekts im Festkörper widerspricht theoretischen Modellen

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Wird Materie mit Licht bestrahlt, werden Elektronen frei. Die Erklärung dieses photoelektrischen Effekts durch Einstein im Jahr 1905 war ein wesentlicher Schritt von der klassischen hin zur Quantenphysik. Mithilfe ultrakurzer Laserpulse haben Wissenschaftler an der TU München zusammen mit anderen Forschern jetzt den zeitlichen Ablauf des Photoeffekts an Festkörpern näher erforscht. Das überraschende Ergebnis: Unabhängig von ihrer ursprünglichen räumlichen Verteilung gehen die Elektronen gleichzeitig von Bord.

Die Photoemission von Elektronen ist einer der schnellsten Prozesse in der Natur. Bisher fehlten jedoch die geeigneten Beobachtungsmethoden, um den genauen Ablauf in Festkörpern zu beobachten. Inzwischen können Forscher extrem kurzwellige Laserpulse mit einer
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The publisher indicated in each case (see company info by clicking on image/title or company info in the right-hand column) is solely responsible for the stories above, the event or job offer shown and for the image and audio material displayed. As a rule, the publisher is also the author of the texts and the attached image, audio and information material. The use of information published here is generally free of charge for personal information and editorial processing. Please clarify any copyright issues with the stated publisher before further use. In case of publication, please send a specimen copy to service@pressebox.de.