Rapid communicationPhotoelectron emission in femtosecond laser assisted scanning tunneling microscopy |
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| Authors: | W. Pfeiffer F. Sattler S. Vogler G. Gerber J.-Y. Grand R. Möller |
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| Affiliation: | Physikalisches Institut, Universit?t Würzburg, D-97074 Würzburg, Germany, DE
4. Physikalisches Institut, Universit?t Stuttgart, D-70550 Stuttgart, Germany, DE
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| Abstract: | Direct illumination of the tunneling gap in an ultrahigh vacuum scanning tunneling microscope with ultrashort pump-probe laser pulses may offer ultimate spatial and temporal resolution in surface experiments. The electronic bandwidth of the tunneling gap ( 1 THz) does not limit the time resolution. Our experiments show that multiphoton photoelectron emission from the sample limits the application of this detection scheme at high laser fluence. However, a substrate specific pump-probe effect in the photoelectron yield with femtosecond transients is observed on Tantalum and on GaAs(110) surfaces. Received: 5 November 1996 |
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| Keywords: | PACS:42.65.Re 73.40.Gk 79.60.-i |
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