First results using the new DLS Xspress4 digital pulse processor with monolithic segmented HPGe detectors on XAS beamlines

Dennis, G.; Helsby, W.; Omar, D.; Horswell, I.; Tartoni, N.; Hayama, Shusaku; Mikulska, Iuliia; Díaz‐Moreno, Sofía

doi:10.1063/1.5084696

Cited by 6 publications

(3 citation statements)

References 1 publication

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“…Intensity of the incident beam (I 0 ) and the transmitted beam (I t ) were monitored by ionization chambers (filled with a mixture of He, N 2 , and Ar gases). Fluoresence measurements were performed using Canberra 36-pixel Monolithic Segmented Hyer Pure Germanium Dector (HPGe) partnered with the Xspress4 digital pulse processor 53 . For fluorescence measurements, M-N-C powdered samples were pressed into pellets (diameter: 8 mm), while for transmission measurements, standard reference samples were diluted with cellulose before pressing into pellets (diameter: 8 mm).…”

Section: Methodsmentioning

confidence: 99%

Atomically dispersed asymmetric cobalt electrocatalyst for efficient hydrogen peroxide production in neutral media

Liu,

Kang,

Feng

et al. 2024

Nat Commun

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Electrochemical hydrogen peroxide (H2O2) production (EHPP) via a two-electron oxygen reduction reaction (2e- ORR) provides a promising alternative to replace the energy-intensive anthraquinone process. M-N-C electrocatalysts, which consist of atomically dispersed transition metals and nitrogen-doped carbon, have demonstrated considerable EHPP efficiency. However, their full potential, particularly regarding the correlation between structural configurations and performances in neutral media, remains underexplored. Herein, a series of ultralow metal-loading M-N-C electrocatalysts are synthesized and investigated for the EHPP process in the neutral electrolyte. CoNCB material with the asymmetric Co-C/N/O configuration exhibits the highest EHPP activity and selectivity among various as-prepared M-N-C electrocatalyst, with an outstanding mass activity (6.1 × 105 A gCo−1 at 0.5 V vs. RHE), and a high practical H2O2 production rate (4.72 mol gcatalyst−1 h−1 cm−2). Compared with the popularly recognized square-planar symmetric Co-N4 configuration, the superiority of asymmetric Co-C/N/O configurations is elucidated by X-ray absorption fine structure spectroscopy analysis and computational studies.

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Section: Methodsmentioning

confidence: 99%

Atomically dispersed asymmetric cobalt electrocatalyst for efficient hydrogen peroxide production in neutral media

Liu,

Kang,

Feng

et al. 2024

Nat Commun

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“…The main specifications for the Digital Pulse Processor have been defined by the consortium early in the project, and after a review of existing commercialized systems, it was decided to purchase a 10-channel modified Xspress4 DPP developed by DIAMOND. One of the unique features of the Xspress4 is its ability to characterise and potentially correct for inter-pixel effects in segmented monolithic detectors [4].…”

Section: Electronic Chainmentioning

confidence: 99%

XAFS-DET: A new high throughout X-ray spectroscopy detector system developed for synchrotron applications

Orsini

Aplin

Balerna

et al. 2023

Nuclear Instruments and Methods in Physics Research Section A:

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“…These events are removed in current commercial detectors using a collimator in front of the germanium sensor, at a cost of a significant reduction of the active area. Xspress4 DPP [12] will include a firmware option to reject charge sharing events, which is not available in recent commercial DPPs, like XIA-FalconX [13] or Xspress3M/X [14,15]. where C is the cadmium concentration in ppm (9150 ppm), N P ixels is the number of sensor elements (36 or 225), ICR P ixel is the pixel input count rate in counts per second (cps), DT is the DPP dead time in %, P/B is the Signal-to-Background ratio, P/T is the Signal-to-Total spectrum ratio and T exp is the exposure time in seconds (60 sec).…”

Section: Simulation Of the Performance Of A Multi-element Germanium D...mentioning

confidence: 99%

Detection limit of next-generation of multi-element germanium detectors in the context of Environmental science

Iguaz

Saleem

Fonda

et al. 2022

J. Phys.: Conf. Ser.

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One of the main challenges in Environmental sciences is the identification and chemical evolution of polluting traces (e.g, cadmium or antimony) in soil, which requires long acquistion times for accurate measurements at synchrotron facilities. In this context, the potential of a new generation multi-element germanium detectors to identify traces at 0.1-1 ppm in a reasonable time has been studied using Allpix Squared framework [1]. This code has been customized to include the three dimensional electric and weighting field maps generated by COMSOL Multiphysics software, and several features to model the sample environment at SOLEIL synchrotron and the signal response of a germanium detector equipped with a Digital Pulse Processor (DPP). The full simulation chain has been validated by experimental data from SAMBA beamline of SOLEIL synchrotron. This work presents a first estimation of the detection limit to cadmium traces in a soil sample for a future multi-element germanium detector, using this simulation chain.

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First results using the new DLS Xspress4 digital pulse processor with monolithic segmented HPGe detectors on XAS beamlines

Cited by 6 publications

References 1 publication

Atomically dispersed asymmetric cobalt electrocatalyst for efficient hydrogen peroxide production in neutral media

Atomically dispersed asymmetric cobalt electrocatalyst for efficient hydrogen peroxide production in neutral media

XAFS-DET: A new high throughout X-ray spectroscopy detector system developed for synchrotron applications

Detection limit of next-generation of multi-element germanium detectors in the context of Environmental science

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