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Integration of a versatile bridge concept in a 34?GHz pulsed/CW EPR spectrometer.


ABSTRACT: We present a 34?GHz continuous wave (CW)/pulsed electron paramagnetic resonance (EPR) spectrometer capable of pulse-shaping that is based on a versatile microwave bridge design. The bridge radio frequency (RF)-in/RF-out design (500?MHz to 1?GHz input/output passband, 500?MHz instantaneous input/output bandwidth) creates a flexible platform with which to compare a variety of excitation and detection methods utilizing commercially available equipment external to the bridge. We use three sources of RF input to implement typical functions associated with CW and pulse EPR spectroscopic measurements. The bridge output is processed via high speed digitizer and an in-phase/quadrature (I/Q) demodulator for pulsed work or sent to a wideband, high dynamic range log detector for CW. Combining this bridge with additional commercial hardware and new acquisition and control electronics, we have designed and constructed an adaptable EPR spectrometer that builds upon previous work in the literature and is functionally comparable to other available systems.

SUBMITTER: Band A 

PROVIDER: S-EPMC5837943 | biostudies-literature | 2018 Mar

REPOSITORIES: biostudies-literature

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Integration of a versatile bridge concept in a 34 GHz pulsed/CW EPR spectrometer.

Band Alan A   Donohue Matthew P MP   Epel Boris B   Madhu Shraeya S   Szalai Veronika A VA  

Journal of magnetic resonance (San Diego, Calif. : 1997) 20180202


We present a 34 GHz continuous wave (CW)/pulsed electron paramagnetic resonance (EPR) spectrometer capable of pulse-shaping that is based on a versatile microwave bridge design. The bridge radio frequency (RF)-in/RF-out design (500 MHz to 1 GHz input/output passband, 500 MHz instantaneous input/output bandwidth) creates a flexible platform with which to compare a variety of excitation and detection methods utilizing commercially available equipment external to the bridge. We use three sources of  ...[more]

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