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Published on: July 4, 2016
A low-frequency pulsed EPR spectrometer for hyperfine clock transition measurement
Yujin Wu1, Bingcai Chen1, Jiayue Yuan1,2
1College of Science, National University of Defense Technology, Changsha, 410073, China.
Abstract:
Low-frequency electron paramagnetic resonance (EPR) spectroscopy proves large sample space and special selectivity to hyperfine spin related transitions in molecules. For instance, the hyperfine clock transition in endohedral phosphorus fullerene (P@C60), which has been proposed for solid-state chip-scale atomic clocks (CSACs), is at the low frequency of 239 MHz. To probe this clock transition, we have developed a dedicated low-frequency EPR spectrometer. Comprehensive characterization of its core components confirms that the spectrometer fulfills the essential sensitivity requirements for clock transition measurements. The limited spin concentration of the available P@C60 sample allowed only the detection of a faint suspected signal. Several pathways were identified to enhance the signal to a level sufficient for its development as a frequency reference.
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