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Time-resolved X-ray spectroscopy of optical-field-ionized plasmas

Published online by Cambridge University Press:  09 March 2009

S. Borgström ,
T. Starczewski ,
S. Svanberg ,
C.-G. Wahlström ,
E. Fill  and
J. Steingruber
S. Borgström
Affiliation:
Department of Physics, Lund Institute of Technology, S-221 00 Lund, Sweden
T. Starczewski
Affiliation:
Department of Physics, Lund Institute of Technology, S-221 00 Lund, Sweden
S. Svanberg
Affiliation:
Department of Physics, Lund Institute of Technology, S-221 00 Lund, Sweden
C.-G. Wahlström
Affiliation:
Department of Physics, Lund Institute of Technology, S-221 00 Lund, Sweden
E. Fill
Affiliation:
Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany
J. Steingruber
Affiliation:
Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany
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Abstract

The time-dependent soft X-ray emission of helium and nitrogen plasmas generated by optical-field ionization is reported. The experiments were carried out by focusing pulses of the high-power Ti:sapphire laser of the Lund Institute of Technology (λ = 796 nm, pulse duration 150 fs, pulse energy 150 mJ) to a 50-μm diameter spot close to a nozzle, using He and N2 as target gases. The emission on He+, N4+, and N3+ resonance lines was recorded by means of a flat-field grating spectrometer coupled to an X-ray streak camera. A pronounced difference in the temporal shape of the emission of the Lyman-α line of hydrogen-like helium and of the 2p−3d resonance lines of lithium-like and beryllium-like nitrogen was observed. The helium line exhibited an initial spike followed by a slow revival of the emission, whereas the nitrogen lines showed a slow decay after a fast initial rise. These observations are explained with the help of simulations.

Type
Research Article
Information
Laser and Particle Beams , Volume 13 , Issue 4 , December 1995 , pp. 459 - 468
Copyright
Copyright © Cambridge University Press 1995

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