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X‐ray emission spectroscopy (XES) is a powerful element‐selective tool to analyze the oxidation states of atoms in complex compounds, determine their electronic configuration, and identify unknown compounds in challenging environments. Until now the low efficiency of wavelength‐dispersive X‐ray spectrometer technology has limited the use of XES, especially in combination with weaker laboratory X‐ray...
We are developing a tabletop apparatus for time-resolved x-ray absorption spectroscopy. Short x-ray pulses are generated by focusing a pulsed 800 nm laser onto a water jet target. X-rays that pass through a sample of interest are detected using energy-resolving superconducting microcalorimeter detectors. We have successfully observed EXAFS features from iron tris(bipyridine) in a water solution. We...
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.
We directly measure the optical gain and threshold current of lithographically-defined quantum dots. A peak groundstate gain of 1.8 cm−1 is determined. We also measure the recovery dynamics of the groundstate with the device biased above and below transparency using ultrafast differential transmission spectroscopy.
We demonstrate experimentally the advantages of driving laser-assisted photoemission from surfaces with long-wavelength-IR light. We show that applications in probing surface dynamics benefit from using longer-wavelengths since many side effects of strong fields are suppressed.
We present the first direct measurement of inner shell relaxation dynamics on complex systems, in this case an adsorbate on a surface. We measured a lifetime of 7fs for N-shell vacancies of Xe on Pt(111).
We present the first direct measurement of inner shell relaxation dynamics on complex systems, in this case an adsorbate on a surface. We measured a lifetime of 7 fs for N-shell vacancies of Xe on Pt(111).
We present the first observation of the laser-assisted photoelectric effect in surface photoemission. Illuminating a Pt(111) sample simultaneously with 1.6 eV and 42 eV pulses, we observe ldquodressingrdquo of the EUV photoelectron spectrum.
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