Author/Authors :
B. M. Smirnov and H. Weidele ، نويسنده , , H. and Kreisle، نويسنده , , D. and Recknagel، نويسنده , , E. and Schulze Icking-Konert، نويسنده , , G. and Handschuh، نويسنده , , H. and Gantefِr، نويسنده , , G. and Eberhardt، نويسنده , , W.، نويسنده ,
Abstract :
Photoelectron spectra of small mass-separated Wn− clusters cooled cooled in a seeding gas are recorded with a low laser flux that ensures single-photon events. The spectra exhibit (i) sharp features due to direct photoemission and (ii) a broad emission signal whose intensity decreases with increasing kinetic energy. The latter is caused by delayed electron emission, a process similar to bulk ‘thermionic emission’. The kinetic energy distribution of these electrons can be approximated by a Boltzmann function with a temperature corresponding to the photon energy divided by the number of vibrational degrees of freedom of the cluster.
