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Nonresonant ionization of oxygen molecules by femtosecond pulses: Plasma dynamics studied by time-resolved terahertz spectroscopy
 

Summary: Nonresonant ionization of oxygen molecules by femtosecond pulses:
Plasma dynamics studied by time-resolved terahertz spectroscopy
Zoltan Mics, Filip Kadlec, and Petr Kuzela
Institute of Physics, Academy of Sciences of the Czech Republic, and Center for Biomolecules and Complex
Molecular Systems, Na Slovance 2, 182 21 Prague 8, Czech Republic
Pavel Jungwirth
Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, and Center
for Biomolecules and Complex Molecular Systems, Flemingovo nam. 2, 166 10 Prague 6,
Czech Republic
Stephen E. Bradforth
Department of Chemistry, University of Southern California, Los Angeles, California 90089
V. Ara Apkarian
Department of Chemistry, University of California, Irvine, California 92697
Received 6 June 2005; accepted 19 July 2005; published online 14 September 2005
We show that optical pump-terahertz probe spectroscopy is a direct experimental tool for exploring
laser-induced ionization and plasma formation in gases. Plasma was produced in gaseous oxygen by
focused amplified femtosecond pulses. The ionization mechanisms at 400- and 800-nm excitation
wavelengths differ significantly being primarily of a multiphoton character in the former case and
a strong-field process in the latter case. The generation of the plasma in the focal volume of the laser
and its expansion on subnanosecond time scale is directly monitored through its density-dependent

  

Source: Apkarian, V. Ara - Department of Chemistry, University of California, Irvine
Kužel, Petr - Institute of Physics, Academy of Sciences of the Czech Republic

 

Collections: Chemistry; Physics