Klavs Hansen (University of Gothenburg and Tianjin Nanoscience)
Ionization of molecules may proceed via different mechanisms. Some are thermal in nature, notably the thermionic emission observed for refractory metals and fullerenes. Another is the quasi-equilibrium hot electron emission observed after deep sub threshold photon absorption in femtosecond laser pulses. Recent experiments have demonstrated that this mechanism is also active after absorption of a single photon and competes favorably with direct ionization. Results from the experiments will be presented and the theoretical background discussed.