CIQTEK is the manufacturer and global supplier of high-value scientific instruments, such as Scanning Electron Microscopes (SEMs), Electron Paramagnetic Resonance (Electron Spin Resonance) Spectroscopy, Scanning NV Probe Microscope, Gas Adsorption Analyzer, etc.
electron spin resonance spectroscopy best price
electron spin resonance spectroscopy best price

X-Band CW-EPR Spectroscopy | EPR200-Plus

The CIQTEK EPR200-Plus Spectroscopy provides professional continuous wave electron paramagnetic resonance solutions for industrial and academic users.


>> EPR200-Plus Accessories: Dual Mode Resonator, High-temperature System, Liquid Nitrogen Variable Temperature With Cryostat, Liquid helium Variable Temperature, Liquid Helium-free Dry Cryogenic System, Time-resolved EPR System, Goniometers, Irradiation system, Flat cell.


Electron paramagnetic resonance (EPR) or electron spin resonance (ESR) spectroscopy is a powerful analytical method to study the structure, dynamics, and spatial distribution of unpaired electronics in paramagnetic substances. It can provide in-situ and non-destructive information on electron spins, orbitals, and nuclei at the microscopic scale. EPR spectroscopy is particularly useful for studying metal complexes or organic radicals so it has important applications in the fields of chemistry, materials, physics, environment, etc.

  • # Diversified Experiments
    Optional: in-situ light system, liquid nitrogen and helium cryostat, high-temperature system, automated goniometer, electrochemical system, etc
  • # Built-in Calibration
    The built-in Mn standard for accurate quantitative EPR calculations and g-value correction calculations. The detachable assembly for easy switching between unlabeled and labeled tests.
  • # Absolute Quantitative EPR
    Absolute quantification of unpaired electron spins can be used to obtain the number of unpaired spins in a test sample in a fast and direct way without the use of reference or standard samples.
    • # Simple Software
      Automated software operation, including automatic tuning, automatic cornering, etc. The software supports 1D and 2D scanning modes. Integrated instrument control software, data processing software, and free radical capture database, testing, and data processing can be performed simultaneously.
    • # High-quality Service
      A professional support team to provide technical services at any time.

EPR Spectrometer Advanced Microwave Technology

Advanced Microwave Technology

The ultra-low noise microwave generation technology combined with weak signal detection technology guarantees the high sensitivity of the EPR (ESR) spectrometer.


EPR Spectrometer Customized Probes Design

Customized Probes Design

The probes can be equipped with optional continuous wave high Q probes, high-temperature probes, dual mode cavities, etc. Meanwhile, the probe can be customized to meet the needs of different scenarios.


EPR Spectrometer Superior Magnetic Field System

Superior Magnetic Field System

The maximum magnetic field strength can reach 1.5 T. The precise magnetic field scanning control technology makes the magnetic field uniformity better than 10 ppm and the long-time stability of the magnetic field better than 10 mG/h, guaranteeing high-quality spectra.


EPR Spectrometer Superior Magnetic Field System

Professional Spectrum Analysis Service

Experienced technical application engineers provide professional EPR (ESR) services to help beginners master the analysis and attribution of EPR spectra.


  • EPR in Chemicals
    EPR in Chemicals
    Study of structures of coordination compounds, catalytic reactions, free radicals detection, reactive oxygen species (ROS) detection, chemical kinetics (reaction kinetics), and small-molecule drugs.
  • EPR in Environmental Science
    EPR in Environmental Science
    Environmental monitoring includes air pollution(PM2.5), advanced oxidation wastewater treatment, transition metals heavy metals, environmentally persistent free radicals, etc.
  • EPR in Materials Science
    EPR in Materials Science
    Single-crystal defects, magnetic material properties, semiconductor conduction electrons, solar cell materials, polymer properties, fiber optic defects, catalytic material detection, etc.
  • #
    EPR in Biomedical
    Research about antioxidant characterization, metalloenzyme spin labeling, reactive oxygen species (ROS) and enzyme activity characterization, occupational disease protection, nuclear radiation emergency medical rescue diagnosis classification, cancer radiotherapy irradiation, etc.
  • EPR in Food Science
    EPR in Food Science
    Irradiation dose of agricultural products, beer flavor shelf life, edible oil rancidity detection, alanine dosimeter, antioxidant properties of food and beverage, etc.
  • EPR in Industrial
    EPR in Industrial
    Coating aging research, cosmetic free radical protection factor, diamond trap identification, tobacco filter efficacy, petrochemical free radical quality control, etc.


EPR Application Cases


EPR Applications EPR Detection of Free Radicals

EPR Detection of Free Radicals

Free radicals are atoms or groups with unpaired electrons that are formed when a compound molecule is subjected to external conditions such as light or heat and the covalent bonds are split. For more stable free radicals, EPR can detect them directly and quickly. For short-lived free radicals, they can be detected by spin trapping. For example, hydroxyl radicals, superoxide radicals, single-linear oxygen light radicals, and other radicals produced by photocatalytic processes.

EPR Applications Paramagnetic Metal lons

Paramagnetic Metal lons

For transition metal ions (including iron, palladium, and platinum group ions with unfilled 3d, 4d, and 5d shell respectively) and rare earth metal ions (with unfilled 4f shell), these paramagnetic metal ions can be detected by EPR spectrometer due to the presence of the single electrons in their atomic orbitals, thus obtaining the valence and structure information. In the case of transition metal ions, there are usually multiple valence states and spin states with high and low spins. Parallel modes in a two-mode cavity allow detection of the integer spin regime.

EPR Applications Conduction Electrons in Metal

Conduction Electrons in Metal

The EPR line shape that conducts electrons is related to the size of the conductor, which is of great significance in the field of lithium-ion batteries. EPR can non-invasively probe the interior of the battery to study the deposition process of lithium in a close-to-real situation, from which the microscopic size of metallic lithium deposits can be inferred.

EPR Applications Material Doping And Defects

Material Doping And Defects

Metallofullerenes, as new nanomagnetic materials, have significant application value in magnetic resonance imaging, single-molecule magnets, spin quantum information, and other fields. Through EPR technology, the electron spin distribution in metallofullerenes can be obtained, providing an in-depth understanding of the ultrafine interaction between spin and the magnetic nucleus of metals. It can detect changes in spin and magnetism of metallofullerenes in different environments. (Nanoscale 2018, 10, 3291)


EPR Applications Photocatalysis


Semiconductor photocatalytic materials have become a hot research topic due to their potential applications in environmental, energy, selective organic transformation, medical, and other fields. EPR technology can detect active species generated on the surface of photocatalysts, such as e-, h+, •OH, O2, 1O2, SO3, etc. It can detect and quantify vacancies or defects in photocatalytic materials, assist in studying active sites and reaction mechanisms of photocatalytic materials, optimize parameters for subsequent photocatalytic application processes, detect active species and their proportions during photocatalysis, and provide direct evidence for system reaction mechanisms. The figure shows the EPR spectra of 0.3-NCCN and CN, indicating that 0.3-NCCN contains more unpaired electrons, higher crystallinity, and an extended p-conjugated system, resulting in better photocatalytic performance. (International Journal of Hydrogen Energy, 2022, 47: 11841-11852)



EPR Spectra Analysis: Parallel magnetic field signal of a diamond
Parallel magnetic field signal of a diamond
  EPR Spectra Analysis: Signal of TEMPOL after deaeration
Signal of TEMPOL after deaeration


Validation of EPR Measurements: Various free radical signals
Various free radical signals
  Validation of EPR Measurements: Cu valence
Cu valence



EPR Spectroscopy TR-EPR (Time-resolved EPR / Transient EPR)

TR-EPR (Time-resolved EPR / Transient EPR)

The combination of time-resolved techniques with EPR (ESR) spectroscopy can be used to study transients such as free radicals or excited triplet states during fast reactions.


EPR Spectroscopy High and Low Temperature Variation

High and Low Temperature Variation

High temperature up to 650 K to meet the demand of high-temperature reactions in the petrochemical field and realize in-situ high-temperature EPR detection. Low temperature to liquid nitrogen temperature or even liquid helium temperature, to achieve in-situ detection of weak signals at low temperatures, to help research exploration in the field of chemistry and materials. Fast heat-up and cool-down speeds to meet the needs of variable-temperature testing.


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