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Sökning: WFRF:(Miaja Avila Luis)

  • Resultat 1-4 av 4
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1.
  • Fullagar, Wilfred K., et al. (författare)
  • Beating Darwin-Bragg losses in lab-based ultrafast X-ray experiments
  • 2017
  • Ingår i: Structural Dynamics. - : AIP Publishing. - 2329-7778. ; 4:4
  • Tidskriftsartikel (refereegranskat)abstract
    • The use of low temperature thermal detectors for avoiding Darwin-Bragg losses in lab-based ultrafast experiments has begun. An outline of the background of this new development is offered, showing the relevant history and initiative taken by this work.
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2.
  • Miaja Avila, Luis, et al. (författare)
  • Sub-picosecond, table-top x-ray absorption spectroscopy using superconducting microcalorimeters
  • 2013
  • Ingår i: CLEO: QELS_Fundamental Science 2013 : High Field Effects and X-rays Probes (QTh4D) - High Field Effects and X-rays Probes (QTh4D). - 9781557529725 ; , s. 4-7
  • Konferensbidrag (refereegranskat)abstract
    • We present time-resolved X-ray absorption measurements of vanadium dioxide using ionizations radiation generated by a femtosecond pulsed laser source in combination with superconducting microcalorimeters capable of measuring energies of individual radiation quanta.
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3.
  • O’Neil, Galen C., et al. (författare)
  • Ultrafast Time-Resolved X-ray Absorption Spectroscopy of Ferrioxalate Photolysis with a Laser Plasma X-ray Source and Microcalorimeter Array
  • 2017
  • Ingår i: The Journal of Physical Chemistry Letters. - : American Chemical Society (ACS). - 1948-7185. ; 8:5, s. 1099-1104
  • Tidskriftsartikel (refereegranskat)abstract
    • The detailed pathways of photoactivity on ultrafast time scales are a topic of contemporary interest. Using a tabletop apparatus based on a laser plasma X-ray source and an array of cryogenic microcalorimeter X-ray detectors, we measured a transient X-ray absorption spectrum during the ferrioxalate photoreduction reaction. With these high-efficiency detectors, we observe the Fe K edge move to lower energies and the amplitude of the extended X-ray absorption fine structure reduce, consistent with a photoreduction mechanism in which electron transfer precedes disassociation. These results are compared to previously published transient X-ray absorption measurements on the same reaction and found to be consistent with the results from Ogi et al. and inconsistent with the results of Chen et al. (Ogi, Y.; et al. Struct. Dyn. 2015, 2, 034901; Chen, J.; Zhang, H.; Tomov, I. V.; Ding, X.; Rentzepis, P. M. Chem. Phys. Lett. 2007, 437, 50-55). We provide quantitative limits on the Fe-O bond length change. Finally, we review potential improvements to our measurement technique, highlighting the future potential of tabletop X-ray science using microcalorimeter sensors.
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4.
  • Ullom, J N (creator_code:cre_t)
  • X-ray Spectrometer
  • 2019
  • Patent (övrigt vetenskapligt/konstnärligt)abstract
    • An x-ray spectrometer includes: an x-ray plasma source that produces first x-rays; an x-ray optic in optical communication with the x-ray plasma source and that: receives the first x-rays from the x-ray plasma source; focuses the first x-rays to produce second x-rays; and communicates the second x-rays to a sample that produces product x-rays in response to receipt of the second x-rays and second light; and a microcalorimeter array detector in optical communication with the sample and that receives the product x-rays from the sample.
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  • Resultat 1-4 av 4

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