Instrument Name: X-band electron paramagnetic resonance
Model: Manufacturer: Guoyi Quantum (Hefei) Technology Co., Ltd.
Year of launch: 2022
Introduction:
The X-band pulsed electron paramagnetic resonance spectrometer can function both CW EPR and pulse EPR at the same time. It can not only meet the requirements of conventional CW EPR experiments, but also perform T1, T2, ESEEM (electron-spin echo envelope modulation), HYSCORE (Hyperfine sublevel correlation) and other pulse EPR related tests.
Higher spectral resolution can be achieved to reveal the hyperfine interaction between electrons and nuclei, thus providing users with more material structure information.
The detection of paramagnetism at ultra-low (high) temperature can be realized.

Main technical indicators:
1) Sensitivity (taking weak asphalt as the standard sample) : absolute minimum detectable spin number :≤1.5×10⁹spins/G line width, signal-to-noise ratio :S/N≧2000:1;
2) Resolution: digital resolution: 24bit, magnetic resolution: 15mG;
3) Stability: magnetic field noise (short time stability) : ≤5mG, magnetic field stability (long time stability) : ≤15mG;
4) Microwave system performance: Microwave source: Gunn solid source, maximum leveling power output: 200mW;

5) Microwave power attenuation range: 0~60dB, built-in microwave frequency meter, automatic tuning program and automatic resonator matching, through software control matching screw matching, through software control microwave parameters, microwave tuning mode pattern amplification function, AFC frequency stability: ≤10^-8;
6) Resonant cavity performance: X-band high-sensitivity resonant cavity, maximum modulation amplitude :20 gauss, sensitivity ≧ 2000:1, can detect samples with and without loss, can be used for variable temperature unit, can be in situ light;
7) Performance of the magnet system: the maximum magnetic field strength of the magnet ≧13000 Gauss, the air slot of the double yoke magnet ≧62mm, suitable for variable temperature unit, the power supply of the magnet - power supply: 12kW, the magnet and the magnet power supply need water cooling - energy and the provided magnet match;
8) Field controller performance: magnetic field setting resolution :1mG, scanning speed: 1500G/5s, direct reading of magnetic field indication;
9) Scanning width :-1kG~18kG, one scan of any width is completed;
10) Signal channel performance: modulation frequency :4kHz to 100kHz, step length: 1kHz, within the range of modulation frequency, the amplitude and phase of any frequency are automatically calibrated, phase resolution is 0.1 º, receiver gain 0~106dB, time constant: 0.01ms ~ 5.24s.
The main function of electron paramagnetic resonance spectroscopy is to detect the samples containing free radicals or transition metal ions, and to conduct qualitative and quantitative analysis, so as to obtain the microstructure and dynamic information of the samples.