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  Ultrafast electron relaxation dynamics in laser-ionized gases observed with time-resolved THz spectroscopy

Frischkorn, C., Kampfrath, T., Perfetti, L., Tegeder, P., Wolf, M., & Gericke, D. O. (2008). Ultrafast electron relaxation dynamics in laser-ionized gases observed with time-resolved THz spectroscopy. In IEEE Digest: 33rd Int. Conf. on Infrared, Millimeter and Terahertz Waves (IRMMW-THz) (pp. 186-186). New York, NY 10017, USA: IEEE.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0010-FBA1-4 Version Permalink: https://hdl.handle.net/11858/00-001M-0000-0010-FBA2-2
Genre: Conference Paper

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 Creators:
Frischkorn, Christian1, Author           
Kampfrath, Tobias1, Author           
Perfetti, Luca, Author
Tegeder, Petra, Author
Wolf, Martin1, Author           
Gericke, Dirk O., Author
Affiliations:
1Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              

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 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 O-2(+) 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.

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Language(s): eng - English
 Dates: 2008-11-05
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 436339
URI: http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=4665510
DOI: 10.1109/ICIMW.2008.4665510
 Degree: -

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Title: 33rd Int. Conf. on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)
Place of Event: Pasadena, CA
Start-/End Date: 2008-09-15 - 2008-09-19

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Title: IEEE Digest: 33rd Int. Conf. on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)
Source Genre: Proceedings
 Creator(s):
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Publ. Info: New York, NY 10017, USA : IEEE
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 186 - 186 Identifier: ISBN: 978-1-4244-2119-0