High Frequency EPR Spectrometer for DNP

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Add EPR to your DNP & NMR Systems


The Bridge12 EPR Spectrometer is a shoebox-sized system that enables researchers to upgrade:

  • Gyrotron-based DNP systems to conduct EPR measurements (Option A)
  • NMR systems to conduct low-temperature DNP and EPR measurements on static samples (Option B)

By eliminating the need for additional superconducting magnets, Bridge12 can deliver this capability at a fraction of the cost of conventional systems.

Option A: Optimize DNP sensitivity with EPR measurements

In DNP-NMR spectroscopy, it can be difficult to choose the right polarizing agents (e.g. radicals, metal centers), without knowing their Electron Paramagnetic Resonance (EPR) properties. Researchers may get some sensitivity gain out of a DNP experiment even under non-optimal conditions, but they may forfeit much larger gains that could dramatically improve their results. EPR spectroscopy helps determine the optimal variables for maximizing sensitivity. Conducting high-field (HF) DNP experiments requires HF-EPR spectroscopy because inferring results from other frequencies is extremely prone to errors. While low-field EPR spectrometers are pervasive, HF-EPR spectrometers are hard to build and expensive to buy.

\"\"The Bridge12 EPR spectrometer provides EPR capabilities for gyrotron-based DNP systems at a fraction of the cost by eliminating the need for a second superconducting magnet.

Option A requires three main components: 1) the NMR spectrometer, 2) the transmission line, and 3) the gyrotron. The transmission line links the gyrotron to the DNP probe and typically an overmoded, corrugated waveguide is used to minimize transmission losses.

Bridge12 also offers a connection kit to connect the EPR spectrometer to an existing DNP-NMR spectrometer.

Option B: Conduct low-temperature DNP and EPR on static samples

Buying a new high-field EPR spectrometer is often out of financial reach for most research groups. With the Bridge12 EPR Spectrometer, scientists can upgrade their existing instrumentation – for example a 400 MHz NMR spectrometer with basic EPR capabilities. This adds low-temperature DNP and EPR measurements on static samples to their analytical methods – at a fraction of the cost of a new gyrotron-based DNP-NMR system.

The EPR spectrometer has an integrated solid-state THz source with an output power of > 80 mW at 263 GHz. In combination with a flow cryostat (e.g. Model STVP-NMR from Janis) this is sufficient power for DNP experiments at 40 K and below.

As Option B, the spectrometer operates at frequencies up to 328 GHz (500 MHz, 1H NMR).

Save cost of additional magnets and fit system into any lab space

Current hi\"\"gh-field EPR spectrometer designs have many features that are often not required to gain some basic understanding of the EPR properties of the DNP-NMR sample. As a result high-field EPR spectrometers often fill an entire room and require their own expensive superconducting magnet. Limiting the number of superconducting magnets also lowers your operating costs by reducing the consumption of coolants, such as liquid nitrogen and helium.

The Bridge12 EPR Spectrometer has the size of a shoebox and can eliminate the need for an additional magnet by using your existing instrumentation. The instrument features state-of-the-art microwave/THz and quasi-optical technology. It is available in different configurations such as homodyne or full super-heterodyne detection and allows for reflection and induction mode detection. For time domain measurements the system can be equipped with a high speed digitizer for full pulse operation.

Technical Specifications

  • Operation Frequency: 95, 200, 263, 395 GHz (other frequencies available)
  • Output power: > 80 mW at 263 GHz (available output power strongly depends on the operation frequency)
  • Detection: Homodyne or super-heterodyne detection (time domain detection available)
  • Full computer control

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