期刊
REVIEW OF SCIENTIFIC INSTRUMENTS
卷 83, 期 4, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3700190
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资金
- ANR (FEMTOARPES) [ANR-08-CEXCEC8-011-01]
- Triangle de la Physique
- Ecole Polytechnique
A novel experimental apparatus for time and angle-resolved photoemission on solid surfaces is presented. A 6.28 eV laser source operating at 250 kHz repetition rate is obtained by frequency mixing in nonlinear beta barium borate crystals. This UV light source has a high photon flux of 10(13) photons/s with relatively low number of photons/pulse so that Fermi surface mapping over a wide region of the Brillouin zone is possible while mitigating space charge effects. The UV source has been fully characterized spatially, spectrally, and temporally. Its potential for time and angle-resolved photoemission is demonstrated through Fermi surface mapping and photoexcited electron dynamics in Bismuth. True femtosecond time resolution <65 fs is obtained while the energy resolution of 70 meV appears to be mainly limited by the laser bandwidth. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3700190]
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