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Order-of-magnitude SNR improvement for high-field EPR spectrometers via 3D printed quasi-optical sample holders. | LitMetric

AI Article Synopsis

  • The text introduces a new 3D printed quasi-optical sample holder designed to enhance the signal-to-noise ratio (SNR) in high-field electron paramagnetic resonance (HFEPR) spectrometers, which do not use resonators.
  • The sample holder features an adjustable positioner and a rooftop mirror that help optimize the sample's position and microwave polarization, leading to improved isolation of co-polar signals by over 20 decibels.
  • This enhancement allows for rapid-scan EPR experiments to capture the full spectra of narrow-line radicals within milliseconds, facilitating real-time monitoring of changes in the sample's line shape.

Article Abstract

Here, we present a rapidly prototyped, cost-efficient, and 3D printed quasi-optical sample holder for improving the signal-to-noise ratio (SNR) in modern, resonator-free, and high-field electron paramagnetic resonance (HFEPR) spectrometers. Such spectrometers typically operate in induction mode: The detected EPR ("cross-polar") signal is polarized orthogonal to the incident ("co-polar") radiation. The sample holder makes use of an adjustable sample positioner that allows for optimizing the sample position to maximize the 240-gigahertz magnetic field and a rooftop mirror that allows for small rotations of the microwave polarization to maximize the cross-polar signal and minimize the co-polar background. When optimally tuned, the sample holder was able to improve co-polar isolation by ≳20 decibels, which is proven beneficial for maximizing the SNR in rapid-scan, pulsed, and continuous-wave EPR experiments. In rapid-scan mode, the improved SNR enabled the recording of entire EPR spectra of a narrow-line radical in millisecond time scales, which, in turn, enabled real-time monitoring of a sample's evolving line shape.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10511183PMC
http://dx.doi.org/10.1126/sciadv.adi7412DOI Listing

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