The absolute yields of multiply charged ions of the noble gases argon, krypton, and xenon as functions of laser intensity at ^=586 nm is reported. The measurements were performed with a well characterized picosecond dye laser in the range 10 13 to 4xl0 14 W/cm 2 . Charge states up to Ar +4 , Kr +5 , and Xe +6 were observed at the highest intensities. An extension of the Keldysh-Reiss-Faisal theory which accounts for the Coulomb field of the residual ion is presented and found to be in good agreement with the experimental results with no adjustable parameters.
We are developing a long-duration K-α x-ray source at the Omega laser facility. Such sources are important for x-ray scattering measurements at small scattering angles where high spectral resolution is required. To date, He-α x-ray sources are the most common probes in scattering experiments, using ns-class lasers to heat foils to keV temperatures, resulting in K-shell emission from He-like charge states. The He-α spectrum can be broadened by emission from multiple charge states and lines (e.g., He-like, Li-like, Be-like). Here, we combine the long duration of He-α sources with the narrow spectral bandwidth of cold K-α emission. A Ge foil is irradiated by the Omega laser, producing principally Ge He-α emission, which pumps Zn K-α emission at 8.6 keV from a nearby Zn layer. Using this technique, we demonstrate a long-duration Zn K-α source suitable for scattering measurements. Our experimental results show a 60% reduction in spectral bandwidth compared to a standard Zn He-α source, significantly improving the measurement precision of scattering experiments with small inelastic shifts.
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