Advanced detection systems for X-ray fluorescence excitation spectroscopy

Abstract

This paper accounts for selected detector developments carried out over the past 15 years within the ESRF X-ray Absorption Spectroscopy group. This includes various types of photodiodes used as integrated current detectors. Special emphasis is put on the long-standing development of a Si drift-diode array suitable for energy-dispersive detection of X-ray fluorescence. This detector, which is now operational, was used to record high-quality XMCD/XAFS spectra on [Fe70Pt30] nanoparticles highly dispersed on a Si wafer. Using numerically deconvoluted spectra, energy resolution was decreased to 82 eV for the Si Kalphabeta line, 126 eV for the Fe Kalpha line and 176 eV for the Pt Lalpha line. A high-vacuum-compatible high-energy-resolution crystal analyzer was also installed on ID12, making it possible to record X-ray fluorescence excitation spectra in the photon-in/photon-out mode over a wide spectral range. Prospects of adapting these methods in order to investigate biological samples are briefly discussed.

Large-mass ultralow noise germanium detectors: performance and applications in neutrino and astroparticle physics

“…The dashed line corresponds to envisioned minimal upgrades to the JFET (see below), resulting in E thr = 200 eV. The dash-dotted line illustrates the ultimate performance (E thr ∼ 100 eV) that can be expected with present-day JFET technology, matching the state-of-the-art in low-noise x-ray detectors [21,24]. The combined effect of threshold and energy resolution can then be folded into the expected differential recoil rate in a reactor experiment (main plot, Fig.…”

X-Ray Detected Magnetic Resonance at Sub-THz Frequencies Using a High Power Gyrotron Source

“…2 a typical display of the vector Spectrum Analyzer (VSA: Agilent Technologies Inc. 89600-SU) operated in the time-averaged mode using a synchronous low frequency triggering reference (F tg = F m /q). In this experiment, the X-ray fluorescence detector was a large area X-ray photodiode associated with a home-made preamplifier/readout electronics [31]. It clearly appears from Fig.…”

Soft X‐Ray Absorption and Emission Spectroscopy in the Studies of Nanomaterials

“…This separation has long been symbolized by the existence of separate triannual international conference series on Vacuum Ultraviolet Radiation Physics 1) and X-ray Physics and Inner Shell Ionization. 2) The utility of hard XAS as a probe of chemical identity in the biological, environmental, and biomedical sciences is well documented [15][16][17][18][19][20][21]. Metals in enzymes can be probed in all oxidation states and spin states, and environmental samples can be examined in a chemically undisturbed form.…”