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Atomic hydrogen as high-precision field standard for high-field EPR

机译:原子氢作为高场EPR的高精度场标准

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We introduce atomic hydrogen trapped in an octaisobutylsilsesquioxane nanocage (H@iBuT_8) 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 ≈ 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.
机译:我们将捕获在八异丁基倍半硅氧烷纳米笼(H @ iBuT_8)中的原子氢作为一种新的分子高精度磁场标准,用于有机自由基和其他系统在g = 2左右的信号的高场EPR光谱。其固态EPR光谱包括两条大约0.2 mT宽的线(约51 mT,以g≈2为中心)的各向同性。各向同性g因子为2.00294(3),基本上与温度无关。在70 K以下,各向同性的〜1H超精细耦合常数为1416.8(2)MHz,在室温下随温度升高至1413.7(1)MHz而略有减小。该标准品的光谱与大多数有机基团的光谱不重叠,并且可以轻松制备并且在室温下稳定。

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