Channeling Vibrational Energy To Probe the Electronic Density of States in Metal Clusters.
We investigate the electronic density of states (DOS) of isolated neutral cobalt clusters by probing the temperature-modulated population of electronic states through UV photoionization. The temperature is controlled via resonant excitation of lattice vibrations using the free-electron laser FELICE, after which the vibrational and electronic systems equilibrate through the electron-phonon coupling, redistributing the population of electronic states. The data are analyzed by surface photoemission theory, modified to incorporate the realistic DOS.
†Radboud University, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, Netherlands.
Jeroen
J
Jalink
‡Radboud University, Institute for Molecules and Materials, FELIX Laboratory, Toernooiveld 7c, 6525 ED Nijmegen, Netherlands.
Joost M
JM
Bakker
†Radboud University, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, Netherlands.
Theo
T
Rasing
†Radboud University, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, Netherlands.
Andrei
A
Kirilyuk
Fermi−Dirac statistics; UV spectroscopy; electron−phonon coupling; resonant IR vibrational spectroscopy; thermal repopulation; transition-metal clusters