Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5406684 | Journal of Magnetic Resonance | 2010 | 6 Pages |
Abstract
We introduce atomic hydrogen trapped in an octaisobutylsilsesquioxane nanocage (H@iBuT8) as a new molecular high-precision magnetic field standard for high-field EPR spectroscopy of organic radicals and other systems with signals around g = 2. Its solid-state EPR spectrum consists of two 0.2 mT wide lines separated by about 51 mT and centered at g â 2. The isotropic g factor is 2.00294(3) and essentially temperature independent. The isotropic 1H hyperfine coupling constant is 1416.8(2) MHz below 70 K and decreases slightly with increasing temperature to 1413.7(1) MHz at room temperature. The spectrum of the standard does not overlap with those of most organic radicals, and it can be easily prepared and is stable at room temperature.
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Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Stefan Stoll, Andrew Ozarowski, R. David Britt, Alexander Angerhofer,