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该论文提出了一种便携式14GHz双模脉冲和连续波电子顺磁共振（EPR）光谱仪，采用次谐波技术实现小型化和高性能，解决了传统EPR设备体积大、成本高的问题，适用于生物医学和量子技术领域。
University of Southern California, Los Angeles, CA Electron paramagnetic resonance (EPR) is a powerful spectroscopic technique for direct detection and characterization of free radicals, with high sensitivity and specificity suited for a wide range of uses, including biomedical applications such as site-directed spin labeling and potential applications in quantum technology such as spin qubit control. Unpaired electrons within a static magnetic field B0 undergo splitting in energy levels (Zeeman effect), and energy transitions may be excited by applying an oscillating field B1 with a frequency ω0 determined by B0. In continuous-wave (CW) experiments, B0 or ω0 is swept, typically with frequency or field modulation to enhance sensitivity. In pulse experiments, B1 pulses are applied to manipulate the electron spins, and the transient evolution of the magnetization is detected. These methods are complementary: CW EPR
Jui-Hung Sun, Michella Rustom, Thanh Dat Nguyen, Jaideep Singh, Peter Qin, Constantine Sideris