Sakaguchi, S., et al., Proton polarization in photo-excited aromatic molecule at room temperature enhanced by intense optical source and temperature control. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2013. 317(0): p. 679-684.
Proton polarization at room temperature, produced in a p-terphenyl crystal by using electron population difference in a photo-excited triplet state of pentacene, was enhanced by utilizing an intense laser with an average power of 1.5 W. It was shown that keeping the sample temperature below 300 K is critically important to prevent the rise of the spin–lattice relaxation rate caused by the laser heating. It is also reported that the magnitude of proton polarization strongly depends on the time structure of the laser pulse such as its width and the time interval between them.
Proton polarization in photo-excited aromatic molecule at room temperature enhanced by intense optical source and temperature control
From The DNP-NMR Blog:
Proton polarization in photo-excited aromatic molecule at room temperature enhanced by intense optical source and temperature control
Sakaguchi, S., et al., Proton polarization in photo-excited aromatic molecule at room temperature enhanced by intense optical source and temperature control. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2013(0).
http://www.sciencedirect.com/science/article/pii/S0168583X13008872
nmrlearner
News from NMR blogs
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11-21-2013 01:14 AM
Temperature dependence of high field 13C dynamic nuclear polarization processes with trityl radicals below 35 Kelvin
From The DNP-NMR Blog:
Temperature dependence of high field 13C dynamic nuclear polarization processes with trityl radicals below 35 Kelvin
Walker, S.A., et al., Temperature dependence of high field 13C dynamic nuclear polarization processes with trityl radicals below 35 Kelvin. Phys. Chem. Chem. Phys., 2013.
http://dx.doi.org/10.1039/C3CP51628H
Achievement of high nuclear spin polarization using lanthanides as low-temperature NMR relaxation agents
From The DNP-NMR Blog:
Achievement of high nuclear spin polarization using lanthanides as low-temperature NMR relaxation agents
Peat, D.T., et al., Achievement of high nuclear spin polarization using lanthanides as low-temperature NMR relaxation agents. Phys. Chem. Chem. Phys., 2013. 15(20): p. 7586-7591.
http://www.ncbi.nlm.nih.gov/pubmed/23588269
nmrlearner
News from NMR blogs
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06-17-2013 06:41 PM
[Question from NMRWiki Q&A forum] bulk water relaxation dependence on temperature
bulk water relaxation dependence on temperature
Is liquid water's relaxation rate strongly dependent on temperature, and does anyone have a link to a good online article with the dependency equation?Thanks!
Check if somebody has answered this question on NMRWiki QA forum
nmrlearner
News from other NMR forums
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12-23-2011 10:21 AM
Proton NMR Based Investigation of the Effects of Temperature and NaCl on Micellar Properties of CHAPS.
Proton NMR Based Investigation of the Effects of Temperature and NaCl on Micellar Properties of CHAPS.
Proton NMR Based Investigation of the Effects of Temperature and NaCl on Micellar Properties of CHAPS.
J Phys Chem B. 2011 Feb 15;
Authors: Qin X, Liu M, Zhang X, Yang D
The effects of temperature and NaCl on the micellization of CHAPS, a zwitterionic detergent widely used in membrane protein studies, have been investigated by NMR spectroscopy. We found that the two apparent critical micelle concentration (cmc) values of CHAPS decrease with the...
nmrlearner
Journal club
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02-17-2011 07:58 PM
[NMR paper] Improving NMR sensitivity in room temperature and cooled probes with dipolar ions.
Improving NMR sensitivity in room temperature and cooled probes with dipolar ions.
Related Articles Improving NMR sensitivity in room temperature and cooled probes with dipolar ions.
J Magn Reson. 2005 Apr;173(2):339-43
Authors: Lane AN, Arumugam S
The response of inverse triple resonance cold and conventional probes to ionic strength has been compared under a variety of conditions relevant to protein NMR. Increasing the salt concentration degrades probe performance in terms of sensitivity, and the effect is more severe for cold probes and...
nmrlearner
Journal club
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11-25-2010 08:21 PM
[U. of Ottawa NMR Facility Blog] Temperature Calibration - An Alternative Method
Temperature Calibration - An Alternative Method
It is well known that the actual temperature of a sample in an NMR probe is not necessarily the same as that read from the variable temperature unit on the spectrometer. This is because the thermocouple used by the variable temperature unit is below the sample tube and not in the center of the rf coil where the NMR measurements are made. One normally must make a calibration plot for the actual temperature vs. the set temperature. For temperatures above room temperature this can be done by employing the known temperature dependent chemical...
Proton polarization in photo-excited aromatic molecule at room temperature enhanced by intense optical source and temperature control
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