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Laser-plasma-based vacuum-ultraviolet light source for tunable single-photon ionization.

Antonio Borghese1, Tonia M Di Palma

  • 1Istituto Motori, Consiglio Nazionale delle Ricerche, Via Marconi 8, 80125 Napoli, Italy. a.borghese@im.cnr.it

Applied Optics
|August 7, 2007
PubMed
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Researchers developed a new vacuum-ultraviolet (VUV) light source using laser-produced plasmas. This efficient VUV source is ideal for sensitive single-photon ionization and VUV spectroscopy applications.

Area of Science:

  • Atomic and Molecular Physics
  • Plasma Physics
  • Spectroscopy

Background:

  • Laser-produced plasmas are a source of intense radiation.
  • Vacuum-ultraviolet (VUV) radiation is valuable for various spectroscopic techniques.
  • Efficiently generating and focusing VUV light presents technical challenges.

Purpose of the Study:

  • To develop and characterize a novel VUV light source.
  • To optimize the generation and focusing of VUV radiation from Xe jet-target laser-produced plasmas.
  • To assess the suitability of the VUV source for single-photon ionization and spectroscopy.

Main Methods:

  • Utilized an embedded-in-the-chamber spectrograph geometry for VUV production, dispersion, and focusing.
  • Employed time-resolved 2D Rayleigh light scattering imaging to visualize plasma dynamics.

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  • Calibrated photon fluxes to quantify source performance.

    • Main Results:

    • Successfully produced and focused VUV radiation onto a line-shaped interaction volume.
    • Achieved photon fluxes exceeding 10(13) photons/pulse cm(2) nm in the 100-200 nm range.
    • Optimized emission intensity and spectral resolution through plasma interaction visualization.

    Conclusions:

    • The developed VUV light source is efficient and spectrally characterized.
    • The high photon flux and spectral properties enable sensitive applications.
    • The source is well-suited for single-photon ionization and time-of-flight mass spectrometry.