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Proceedings Paper

Soft x-ray emission from Ar clusters heated by ultrashort laser pulse
Author(s): Tomas Mocek; Cheon Min Kim; H. J. Shin; Dai Gil Lee; Yong Ho Cha; KyungHan Hong; ChangHee Nam
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Paper Abstract

We report soft x-ray spectra produced by the interaction of 25-100 fs laser pulses at an intensity of up to 7 by 1016 W/cm2 with cryogenically cooled Ar gas jet. New spectral lines from Ar8+, Ar9+ and Ar10+ charge states appeared with decreasing pre- expansion gas temperature. Nonlinear increase of X-ray line emission from Ar7+, Ar8+ and Ar9+ was observed with cooling, which saturated below certain temperature. The change in x-ray spectrum is attributed to efficient collisional heating and collisional ionization of growing small-to-medium sized Ar clusters from the cooled jet. When the laser pulse was extended to 100 fs we have observed considerably stronger emission on lines from high charge states, such as Ar8+, Ar9+ and Ar10+ which suggests that resonance absorption condition could be reached for the 100-fs pulse.

Paper Details

Date Published: 23 April 2001
PDF: 4 pages
Proc. SPIE 4424, ECLIM 2000: 26th European Conference on Laser Interaction with Matter, (23 April 2001); doi: 10.1117/12.425656
Show Author Affiliations
Tomas Mocek, Korea Advanced Institute of Science and Technology and Institute of Physics (Czech Republic)
Cheon Min Kim, Korea Advanced Institute of Science and Technology (South Korea)
H. J. Shin, Korea Advanced Institute of Science and Technology (South Korea)
Dai Gil Lee, Korea Advanced Institute of Science and Technology (South Korea)
Yong Ho Cha, Korea Advanced Institute of Science and Technology (South Korea)
KyungHan Hong, Korea Advanced Institute of Science and Technology (South Korea)
ChangHee Nam, Korea Advanced Institute of Science and Technology (South Korea)


Published in SPIE Proceedings Vol. 4424:
ECLIM 2000: 26th European Conference on Laser Interaction with Matter
Milan Kalal; Karel Rohlena; Milan Sinor, Editor(s)

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