Ultra-Low Temperature Nuclear Magnetic Resonance. Bouleau, E., Lee, D., Saint-Bonnet, P., Hediger, S., & De Paëpe, G. IOP Conference Series: Materials Science and Engineering, 171(1):012142, 2, 2017.
Ultra-Low Temperature Nuclear Magnetic Resonance [link]Website  abstract   bibtex   
Because NMR spectroscopy requests more sensitivity and more resolution, high-frequency and high-power microwave irradiation of electron spins in a magnetic field, Dynamic Nuclear Polarization (DNP) is becoming a common partner for fast sample spinning NMR experiments. Currently, this technics is performed at minimum sample temperatures ∼100 K, using cold nitrogen gas to pneumatically spin and cool the sample. The desire is to improve NMR by providing ultra-low temperatures, using cryogenic helium gas. It is shown that stable and fast spinning can be attained for sample temperatures down to 30 K using a cryostat developed in our laboratory. Using this cryostat to cool a closed-loop of helium gas results in spinning frequencies that can greatly surpass those achievable with nitrogen gas. It results in substantial sensitivity enhancements (∼600) and according experimental time-savings by 2 to 4 orders of magnitude. Therefore, access to this temperature range is demonstrated to be both viable and highly pertinent.
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 title = {Ultra-Low Temperature Nuclear Magnetic Resonance},
 type = {article},
 year = {2017},
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 pages = {012142},
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 websites = {https://iopscience.iop.org/article/10.1088/1757-899X/171/1/012142},
 month = {2},
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 abstract = {Because NMR spectroscopy requests more sensitivity and more resolution, high-frequency and high-power microwave irradiation of electron spins in a magnetic field, Dynamic Nuclear Polarization (DNP) is becoming a common partner for fast sample spinning NMR experiments. Currently, this technics is performed at minimum sample temperatures ∼100 K, using cold nitrogen gas to pneumatically spin and cool the sample. The desire is to improve NMR by providing ultra-low temperatures, using cryogenic helium gas. It is shown that stable and fast spinning can be attained for sample temperatures down to 30 K using a cryostat developed in our laboratory. Using this cryostat to cool a closed-loop of helium gas results in spinning frequencies that can greatly surpass those achievable with nitrogen gas. It results in substantial sensitivity enhancements (∼600) and according experimental time-savings by 2 to 4 orders of magnitude. Therefore, access to this temperature range is demonstrated to be both viable and highly pertinent.},
 bibtype = {article},
 author = {Bouleau, Eric and Lee, Daniel and Saint-Bonnet, Pierre and Hediger, Sabine and De Paëpe, Gaël},
 journal = {IOP Conference Series: Materials Science and Engineering},
 number = {1}
}

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