@inproceedings{d0e21c50d71448e4b7f6c68a9d215615,
title = "Ultrafast electron relaxation dynamics in laser-ionized gases observed with time-resolved THz spectroscopy",
abstract = "Ultrashort broadband THz pulses are applied to probe the electron dynamics of various gases following ionization by an intense femtosecond laser pulse. The dielectric function of the plasma is found to be Drude-like and yields the temporal evolution of the density and collision rate of the free electrons. The electron decay in a plasma with molecular ions such as O2+ is much faster than in monatomic plasmas like Ar+/e- due to dissociative recombination which is only possible in molecular plasmas. However, adding a small amount of the electron scavenger SF6 to Ar substantially accelerates the electron decay and enables one to reliably determine the electronic temperature. Furthermore, anomalously high, metal-like electron collision rates are found. Kinetic plasma theory dramatically underestimates these rates pointing towards additional velocity-randomizing processes like collective excitations.",
author = "C. Frischkorn and T. Kampfrath and L. Perfetti and P. Tegeder and M. Wolf and Gericke, \{D. O.\}",
year = "2008",
month = dec,
day = "31",
doi = "10.1109/ICIMW.2008.4665510",
language = "English",
isbn = "9781424421206",
series = "33rd International Conference on Infrared and Millimeter Waves and the 16th International Conference on Terahertz Electronics, 2008, IRMMW-THz 2008",
booktitle = "33rd International Conference on Infrared and Millimeter Waves and the 16th International Conference on Terahertz Electronics, 2008, IRMMW-THz 2008",
note = "33rd International Conference on Infrared and Millimeter Waves and the 16th International Conference on Terahertz Electronics, 2008, IRMMW-THz 2008 ; Conference date: 15-09-2008 Through 19-09-2008",
}