Laser-induced electron emission from an Au surface irradiated by single picosecond pulses at λ=2.94 μm. The intermediate region between multiphoton and tunneling effects
✍ Scribed by C. Tóth; G. Farkas; K. L. Vodopyanov
- Publisher
- Springer
- Year
- 1991
- Tongue
- English
- Weight
- 621 KB
- Volume
- 53
- Category
- Article
- ISSN
- 0721-7269
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✦ Synopsis
The photoinduced electron emission from the surface of a solid gold target irradiated by single picosecond pulses of an erbium laser is investigated. The applied laser intensity (5-120 G W / c m 2) corresponds to the intermediate interaction region between the pure multiphoton and tunnel effects, where the decisive Keldysh-parameter, 7, is in the range 1 < ? < 12 = no. In the light intensity region which is free of surface heating (IL < 80 GW/cm2), the slope of the measured logarithmic intensity dependence of the photocurrent decreases from the no = 12 perturbative value down to n --5. Therefore the experiment shows that the Keldysh-type theories, which have recently been proved to describe correctly the ionization of atoms, are also valid to a certain extent in the case of the photoeffect in metals.