X-Band CW-EPR Spectroscopy

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.

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

Features

Diversified Experiment Scenarios

It can be equipped with an in-situ optical stimulation system, liquid nitrogen liquid helium cryogenic system, high-temperature system, automated goniometer system, electrochemical system, etc. to meet the needs of multi-scene experiments.

Built-in Calibration

The built-in Mn standard for accurate quantitative EPR calculations and g-value correction calculations, and the detachable assembly allows for easy switching between unlabeled and labeled tests.

Absolute Quantitative EPR Technology

The absolute quantification of unpaired electron spins can be used to easily, quickly, and directly obtain the spin number of unpaired electrons in a test sample without the use of a reference or standard sample.

Simple and Easy-to-use Software

Automated software operation, including automatic tuning, automatic cornering, and other functions. The software supports 1D and 2D scanning modes to meet the needs of various testing applications. Integrated instrument control software, data processing software, and free radical capture database, testing, and data processing can be performed simultaneously.

High-quality technical and after-sales service

High-quality Support & Service

Professional support team to provide professional technical services at any time. High-quality after-sales service team, solving basic problems within 48 hrs, handling tough challenges within one week, proposing clear solutions.

Core Technology

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 spectrometer probes can be equipped with optional continuous wave high Q probes, high-temperature probes, dual mode cavities, etc. Meanwhile, based on the high-quality probe design technology, the probe can be customized to meet the needs according to the usage scenario.

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

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

Antioxidant characterization, metalloenzyme spin labeling, reactive oxygen species (ROS) and enzyme activity characterization, occupational disease protection research, nuclear radiation emergency medical rescue diagnosis classification, cancer radiotherapy irradiation related research, 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.

Applications

Detection of Free Radicals. Free radicals are atoms or groups with unpaired electrons formed when a compound molecule is subjected to external conditions, such as heat and light, and the covalent bonds are split evenly. For the more stable free radicals, EPR (ESR) allows direct and rapid detection of them. For short-lived free radicals, they can be detected by means of self-selected capture, such as hydroxyl radicals, superoxide radicals, singlet oxygen, etc., generated by photocatalytic processes. EPR spectrum of different free radicals trapped by DMPO. EPR spectrum of the capture of singlet oxygen by TEMP. EPR spectrum of Perylene. EPR spectrum of Vanadyl acetylacetonate. Perpendicular-mode and parallel-mode EPR spectrum of CR3+ doped CSAL(SO4)2-12H2OEPR spectrum. Paramagnetic Metal Ions. For transition metal ions (including ferrous, palladium, and platinum ions, which have unfilled 3d, 4d, and 5d shells in that order) and rare earth metal ions (which have unfilled 4f shells), EPR (ESR) can be used to detect these paramagnetic metal ions to obtain valence and structure information due to the single electron in their atomic orbitals. The self-selected states are of high and low spin for transition metal ions, which usually have multiple valence states. The parallel mode in the two-mode cavity allows detection of the integer spin regime. Conduction Electrons in Metal. The EPR (ESR) lineshape of conduction electrons is related to the size of the conductor, which is important in the field of lithium electronic batteries. EPR (ESR) enables non-invasive probing of the inside of the battery and the study of lithium deposition processes close to the real situation, from which the microscopic size of lithium metal deposits can be inferred. Free Radical Pairs/Triplet States. For very short-lived species such as the triplet state, testing can be carried out by transient EPR (ESR). TR-EPR spectrum of TMDPO. A vacancy is a concept in solid-structure chemistry or materials science, referring to structures without proper atoms in the lattice. Common vacancy includes Oxygen Vacancy, Carbon Vacancy, Nitrogen Vacancy, Sulfur Vacancy, etc. EPR spectra of oxygen vacancies and sulphur vacancies

Expandable Functions

TR-EPR (time-resolved EPR / transient EPR)

The combination of time-resolved techniques with paramagnetic resonance 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 reaction 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 temperature rise and fall to meet the needs of variable temperature testing.

Related News & Events

CIQTEK EPR Spectroscopy Contributes to Scientific Publications for Research Users

CIQTEK EPR (ESR) spectroscopy has helped several research users get scientific data and the results were finally published in high-level journals.

CIQTEK-Sponsored RSC ESR 2022 Meeting Came to a Big Success

CIQTEK sponsored the 55th Royal Society of Chemistry International EPR Conference, held at the University of St. Andrews in Scotland, UK, from June 6-10, 2022.

CIQTEK EPR Spectroscopy: Interview with Dr. Haijun Yang, Tsinghua University, China

We were honored to have Dr. Haijun Yang present his experience and feedback on the use of the CIQTEK EPR (ESR) spectroscopy since it was purchased and used by Tsinghua University MR Laboratory in 2020.

Chongqing University Launches Analysis Services using CIQTEK EPR200-Plus

The Analysis and Testing Center of Chongqing University officially launched its EPR (ESR) analysis and testing services to the society based on CIQTEK EPR200-Plus on Sep.6th, 2021.

Parallel magnetic field signal of a diamond

Signal of TEMPOL after deaeration

Various free radicals signals

Cu valence