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High Precision FRET at Single-molecule Level for Biomolecule Structure Determination

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Measuring partial fluorescence yield using filtered detectors.

T D Boyko¹, R J Green¹, A Moewes¹

¹Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.

Journal of Synchrotron Radiation

|June 28, 2014

Summary

This summary is machine-generated.

This study introduces a novel filtered X-ray detector array for soft X-ray partial fluorescence yield spectroscopy, overcoming dead-time limitations. This advancement enhances data collection efficiency and reduces X-ray damage in synchrotron experiments.

Keywords:

XANES partial fluorescence yield photodiode

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Area of Science:

Materials Science
Spectroscopy
Detector Physics

Background:

X-ray absorption near-edge structure (XANES) typically measures the linear attenuation coefficient.
Partial fluorescence yield (PFY) techniques use energy-discriminating detectors for improved sensitivity and signal-to-background in XANES.
Soft X-ray PFY measurements often require solid-state detectors with limitations due to dead-time, impacting count rate efficiency.

Purpose of the Study:

To develop a dead-time-free method for soft X-ray partial fluorescence yield measurements.
To demonstrate the feasibility of using an array of filtered, non-energy-dispersive detectors for PFY spectroscopy.
To improve photon collection efficiency and reduce radiation damage in synchrotron-based experiments.

Main Methods:

Utilized an array of filtered X-ray detectors, which are not energy-dispersive.
Employed filters to create non-linear, energy-dependent detector responsivity.
Validated the technique using alpha-iron(III) oxide (α-Fe2O3) as a sample material.

Main Results:

Demonstrated that an array of filtered detectors can successfully measure soft X-ray PFY spectra without dead-time limitations.
Showcased the potential for significantly improved photon collection efficiency at synchrotron facilities.
Indicated that experiments can be conducted at lower photon fluxes, thereby minimizing X-ray-induced sample damage.

Conclusions:

An array of filtered X-ray detectors offers a viable, dead-time-free alternative for soft X-ray PFY measurements.
This detector technology promises enhanced experimental efficiency and reduced sample degradation at synchrotrons.
The method is particularly beneficial for soft X-ray spectroscopy where traditional detectors face limitations.