Low temperature probe for dynamic nuclear polarization and multiple-pulse solid-state NMR |
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Authors: | Cho HyungJoon Baugh Jonathan Ryan Colm A Cory David G Ramanathan Chandrasekhar |
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Institution: | Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge MA 02139, USA. |
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Abstract: | Here, we describe the design and performance characteristics of a low temperature probe for dynamic nuclear polarization (DNP) experiments, which is compatible with demanding multiple-pulse experiments. The competing goals of a high-Q microwave cavity to achieve large DNP enhancements and a high efficiency NMR circuit for multiple-pulse control lead to inevitable engineering tradeoffs. We have designed two probes-one with a single-resonance RF circuit and a horn-mirror cavity configuration for the microwaves and a second with a double-resonance RF circuit and a double-horn cavity configuration. The advantage of the design is that the sample is in vacuum, the RF circuits are locally tuned, and the microwave resonator has a large internal volume that is compatible with the use of RF and gradient coils. |
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Keywords: | Dynamic nuclear polarization Multiple-pulse NMR Coherent averaging Low temperature NMR |
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