Charge transport and carrier dynamics in liquids probed by THz time-domain spectroscopy.
We examine the transport properties and the dynamics of free electrons in n-hexane by means of femtosecond spectroscopy using an ultraviolet pump pulse to create the electrons and a THz electromagnetic pulse as a probe. The complex dielectric response of the photogenerated electrons is determined over a broad range of frequencies, from which we infer the electron scattering time and density through the Drude model. The time evolution of the carrier density reveals nongeminate electron-ion recombination within hundreds of picoseconds at high ion concentration.
Knoesel
E
E
Department of Physics, Columbia University, New York, New York 10027, USA.
Bonn
M
M
Shan
J
J
Heinz
T F
TF