CIQTEK is the manufacturer and global supplier of high-performance scientific instruments, such as Electron Microscopes, Electron Paramagnetic Resonance (Electron Spin Resonance), Gas Adsorption Analyzers, Scanning NV Microscopes, etc.
X band CW Electron Resonance Spectroscopy for sale
X band CW Electron Resonance Spectroscopy for sale

X-Band CW-EPR Spectrometer | EPR200-Plus

CIQTEK EPR200-Plus is designed for CW-EPR studies.

Electron paramagnetic resonance (EPR) or electron spin resonance (ESR) spectrometer 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 spectrometer is particularly useful for studying metal complexes or organic radicals so it has important applications in the fields of chemistry, materials, physics, environment, and medicine.


*Accessories: Liquid nitrogen variable temperature with cryostat; Liquid helium variable temperature; Sample tubes; Goniometers;  Electrolytic cell; Irradiation system; Flat cell.

  • # 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.

Advanced Microwave Technology

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


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.


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, which guarantees high-quality spectra.


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 Application Fields

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

Environmental monitoring includes air pollution(PM2.5), advanced oxidation wastewater treatment, transition metals heavy metals, environmentally persistent free radicals, etc.


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

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

Coating aging research, cosmetic free radical protection factor, diamond trap identification, tobacco filter efficacy, petrochemical free radical quality control, etc.


EPR Application Cases

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.


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 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.


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.



Vacancy is a concept in solid structural chemistry or materials science, which refers to a structure in which there are no atoms in a lattice position. Common vacancies include oxygen vacancies, carbon vacancies, nitrogen vacancies, and sulfur vacancies


Free Radical Pairs/Triplet States

For very short-lived species such as triplet states, transient EPR can be used to test.


EPR Spectra: Parallel magnetic field signal of a diamond


EPR Spectra: Signal of TEMPOL after deaeration


EPR Spectra: Various free radical signals


EPR Spectra: Cu valence

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.


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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Please feel free to contact us for more details, request a quote or book an online demo! We will reply you as soon as we can.