A Dynamic Nuclear Polarization spectrometer at 95 GHz/144 MHz with EPR and NMR excitation and detection capabilities

Akiva Feintuch*, Daphna Shimon, Yonatan Hovav, Debamalya Banerjee, Ilia Kaminker, Yaacov Lipkin, Koby Zibzener, Boris Epel, Shimon Vega, Daniella Goldfarb

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

A spectrometer specifically designed for systematic studies of the spin dynamics underlying Dynamic Nuclear Polarization (DNP) in solids at low temperatures is described. The spectrometer functions as a fully operational NMR spectrometer (144 MHz) and pulse EPR spectrometer (95 GHz) with a microwave (MW) power of up to 300 mW at the sample position, generating a MW B1 field as high as 800 KHz. The combined NMR/EPR probe comprises of an open-structure horn-reflector configuration that functions as a low Q EPR cavity and an RF coil that can accommodate a 30-50 μl sample tube. The performance of the spectrometer is demonstrated through some basic pulsed EPR experiments, such as echo-detected EPR, saturation recovery and nutation measurements, that enable quantification of the actual intensity of MW irradiation at the position of the sample. In addition, DNP enhanced NMR signals of samples containing TEMPO and trityl are followed as a function of the MW frequency. Buildup curves of the nuclear polarization are recorded as a function of the microwave irradiation time period at different temperatures and for different MW powers.

Original languageAmerican English
Pages (from-to)136-141
Number of pages6
JournalJournal of Magnetic Resonance
Volume209
Issue number2
DOIs
StatePublished - Apr 2011
Externally publishedYes

Keywords

  • Dynamic Nuclear Polarization
  • EPR cavity
  • W-band pulse EPR

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