In situ electron paramagnetic resonance spectroscopy using single nanodiamond sensors

• URL: http://arxiv.org/abs/2307.13349v1
• Date: Tue, 25 Jul 2023 09:07:56 GMT
• Title: In situ electron paramagnetic resonance spectroscopy using single nanodiamond sensors
• Authors: Zhuoyang Qin, Zhecheng Wang, Fei Kong, Jia Su, Zhehua Huang, Pengju Zhao, Sanyou Chen, Qi Zhang, Fazhan Shi, Jiangfeng Du
• Abstract summary: We show a zero-field EPR technique with spectra robust to the sensor's orientation. We acquire the zero-field EPR spectrum of vanadyl ions in glycerol solution with embedded single NDs.
• Score: 11.37424763147048
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: An ultimate goal of electron paramagnetic resonance (EPR) spectroscopy is to analyze molecular dynamics in place where it occurs, such as in a living cell. The nanodiamond (ND) hosting nitrogen-vacancy (NV) centers will be a promising EPR sensor to achieve this goal. However, ND-based EPR spectroscopy remains elusive, due to the challenge of controlling NV centers without well-defined orientations inside a flexible ND. Here, we show a generalized zero-field EPR technique with spectra robust to the sensor's orientation. The key is applying an amplitude modulation on the control field, which generates a series of equidistant Floquet states with energy splitting being the orientation-independent modulation frequency. We acquire the zero-field EPR spectrum of vanadyl ions in aqueous glycerol solution with embedded single NDs, paving the way towards \emph{in vivo} EPR.

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