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Long- and short-lived electrons with anomalously high collision rates in laser-ionized gases
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Kampfrath, Tobias, Gericke, Dirk O., Perfetti, Luca, Tegeder, Petra, Wolf, Martin and Frischkorn, Christian (2007) Long- and short-lived electrons with anomalously high collision rates in laser-ionized gases. PHYSICAL REVIEW E, 76 (6 Part 2). -. doi:10.1103/PhysRevE.76.066401 ISSN 1539-3755.
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Official URL: http://dx.doi.org/10.1103/PhysRevE.76.066401
Abstract
Ultrashort broadband terahertz pulses are applied to probe the electron dynamics of gaseous Ar and O-2 following ionization by an intense femtosecond laser pulse. The conductivity in the plasma center is extracted by a modified Wentzel-Kramers-Brillouin approach. It exhibits a nearly perfect Drude-like spectral shape and yields the temporal evolution of the free-electron density and collision rate. While the electron density in the Ar plasma remains nearly constant during the first 200 ps after generation, it decays much faster in O-2 due to dissociative recombination which is only possible in molecular plasmas. Adding a small amount of the electron scavenger SF6 to Ar reduces the electron lifetime in the plasma dramatically and allows us to determine the electron temperature to about 20 000 K. Furthermore, anomalously high, metal-like electron collision rates of up to 25 THz are found. Kinetic plasma theory substantially underestimates these rates pointing towards additional and more complex processes randomizing the total electronic momentum. Our results are relevant to both lightning control and generation of terahertz radiation by intense laser pulses in gases.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics | ||||
Journal or Publication Title: | PHYSICAL REVIEW E | ||||
Publisher: | AMER PHYSICAL SOC | ||||
ISSN: | 1539-3755 | ||||
Official Date: | December 2007 | ||||
Dates: |
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Volume: | 76 | ||||
Number: | 6 Part 2 | ||||
Number of Pages: | 11 | ||||
Page Range: | - | ||||
DOI: | 10.1103/PhysRevE.76.066401 | ||||
Publication Status: | Published |
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