bg                      epr-w900
EPR-W900 - W-Band High-frequency EPR (ESR) Spectroscopy
The CIQTEK EPR-W900 is a W-band (94 GHz) high frequency electron paramagnetic resonance (EPR/ESR) spectroscopy that is compatible with both continuous-wave and pulsed EPR test functions and can perform variable temperature experiments from 4-300 K. The EPR-W900 has the same software platform as the X-band spectroscopy CIQTEK EPR100, providing a simple and convenient user experience.
Compared with the traditional X-band EPR technology, high-frequency EPR technology has many advantages and has important applications in the fields of biology, chemistry, and materials.
Advantages of High Frequency EPR

Higher g-factor Resolution


Higher Detection Sensitivity


Overcoming the Larger Zero-field Splitting Energy


Precise Power Conditioning of W-band Microwave Signals


Split superconducting magnets specifically designed for high-frequency EPR, allowing for easy sample changes at any temperature

EPR (ESR) Application Fields
The electron paramagnetic resonance technique is the only spectroscopic technique that allows the direct detection and study of unpaired electrons. Unpaired electrons are widely distributed, such as isolated single atoms, conductors, magnetic molecules, transition metal ions, rare earth ions, ion clusters, doping materials, defective materials, biological free radicals, metal proteins, etc. Many substances do not contain unpaired electrons themselves but produce unpaired electrons upon excitation by light. Therefore, the EPR technique is widely used in physics, chemistry, biology, materials, industry, and other fields.
EPR in Environmental Science
Environmental monitoring, such as air pollution, sewage treatment, transition metals heavy metals, EPRFs.                  
Site-directed spin labeling (SDSL) in combination with EPR spectroscopy is a rapidly expanding powerful biophysical technique to study the structural and dynamic properties of membrane proteins in a native environment.
EPR in Chemistry
Chemical Analysis such as Structure research of coordination compounds, catalytic reactions, detection of free radicals and antioxidants, detection of reactive oxygen species, kinetics of chemical reactions, polymerization reaction mechanism, catalytic mechanism, chemical dosimeter, etc.
EPR in Material Science and Physics
Single crystal defects, magnetic material properties, semiconductor conductive electronics, solar cells, materials, polymer properties, fiber defects, magnetic molecules, EPR imaging, etc.
EPR in Pharma
The formation of free radicals has long been associated with the toxic side effects of drugs. The temporal behavior of free radicals involved in drug systems can identify, quantify, and monitor by analyzing EPR signals.
EPR in Industry
Physical ageing of organic coatings, the radical protection factor for cosmetics, crystallographic defects in diamond, cigarette filter efficiency, free radical control in petrochemical industry, transition metal oxide in lithium ion battery, etc.
EPR in Biomedical Sciences
Antioxidant characterization, NOx detection, reactive oxygen species ROS, occupational disease protection research, nuclear radiation emergency medical rescue diagnosis classification, cancer chemotherapy, radiation-related studies.
EPR in Food Science
Radiation dose of agricultural products, the shelf life of beer flavor, edible oil rancidity test, alanine dosimeter (EPR dosimetry), antioxidants for food and beverages.
Technical Details



Frequency Range

93.5 - 94.5 GHz

Maximum Output Power of Microwave Bridge

Continuous-wave mode: 30 mW;
Pulsed mode: 1 W (2W optional)

Microwave Power Adjustment Range

0 - 50 dB

Pulse Channel Number

4 (+X, +Y, -X, -Y). Support phase cycling

ELDOR (Electron-Electron Double Resonance) Pulse Channel


Microwave Pulse Time Minimum Step

0.05 ns

Cavity Type

TE011, compatible with continuous-wave and pulsed experiments

Unloaded Q-value


Magnetic Field Range

0-6 T superconducting magnets with ±1000 G fast sweep coils

Magnetic Homogeneity

20 ppm @ 10 mm diameter 10 mm height cylinder

Magnet Aperture

75 mm

Variable Temperature System

80-300 K (with liquid nitrogen), 4-300 K (with liquid helium)

Temperature Stability

± 0.1 K

Learn More

-> CIQTEK EPR200M is a portable and easy-to-use desktop EPR (ESR) spectrometer with an economical, low-maintenance, and friendly experience.

-> CIQTEK EPR200-PLUS is an X-Band CW-EPR spectroscopy that has excellent sensitivity performance due to the use of a low noise microwave source and a high-quality factor (Q) resonator.

-> CIQTEK EPR100 is a floor standing X-Band pulsed EPR(ESR) spectroscopy with high performance pulse formation and data acquisition through a high precision control and readout system.

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Contact us (Phone: +86-551-62835225)


CIQTEK Hefei : 1-4F, Area A, E2 Building, Innovation Industrial Park II, High-tech District, Hefei, Anhui

CIQTEK Wuxi : No. 2 Zhanqian Road, Huishan Intercity Railway Station, Huishan District, Wuxi

CIQTEK Shanghai : Room 8405,No.315 Emei Road, North Bund, Hongkou District, Shanghai

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