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Updated: Aug 9, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
Published on: March 30, 2017
Observation of electron gas cooling in free sodium clusters
M Maier1, G Wrigge, M Astruc Hoffmann
1Fakultät für Physik, Universität Freiburg, Stefan-Meier-Strasse 21, D-79104 Freiburg, Germany.
Abstract:
Free size-selected Na+(n) (n = 16-250) clusters have been studied by femtosecond pump-probe photoelectron and photofragmentation spectroscopy. Thermal electron emission from the hot electron gas was used to monitor the energy transfer from the electronic system to lattice vibrations. The electron-phonon coupling constants determined for the different sizes can be described by the radius dependent function g(R) = (2.3 + 114 A2/R2) X 10(16) W/m3K. No strong quantum size effect was observed even for the smallest cluster size.
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