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.
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.
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.
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.
Experienced technical application engineers provide professional EPR (ESR) services to help beginners master the analysis and attribution of EPR spectra.
EPR Application Fields
Study of structures of coordination compounds, catalytic reactions, free radicals detection, reactive oxygen species (ROS) detection, chemical kinetics (reaction kinetics), and small-molecule drugs.
Environmental monitoring includes air pollution(PM2.5), advanced oxidation wastewater treatment, transition metals heavy metals, environmentally persistent free radicals, etc.
Single-crystal defects, magnetic material properties, semiconductor conduction electrons, solar cell materials, polymer properties, fiber optic defects, catalytic material detection, etc.
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.
Irradiation dose of agricultural products, beer flavor shelf life, edible oil rancidity detection, alanine dosimeter, antioxidant properties of food and beverage, etc.
Coating aging research, cosmetic free radical protection factor, diamond trap identification, tobacco filter efficacy, petrochemical free radical quality control, etc.
EPR Application Cases
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.
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.
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
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
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 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.
CIQTEK X-band pulse electron paramagnetic resonance (EPR or ESR) spectroscopy EPR100 supports both continuous-wave EPR and pulse EPR functions, satisfying general CW EPR experiments while performing T1 /T2 / ESEEM (electron-spin echo envelope modulation) / HYSCORE (hyperfine sublevel correlation) and other pulsed EPR tests, which can achieve higher spectral resolution and reveal ultra-fine interactions between electrons and nuclei, thus providing users with more information about the structure of matter. *Optionally equipped with a 4-300 K variable temperature device to enable the detection of paramagnetic substances at ultra-low (high) temperatures.*Accessories: Liquid nitrogen variable temperature with cryostat; Liquid helium variable temperature; 4 mm outer diameter sample tube; Goniometers; Electrolytic cell; Irradiation system; Flat cell.Learn More
CIQTEK EPR-W900 is a W-band (94 GHz) high-frequency electron paramagnetic resonance (EPR or ESR) spectrometer compatible with both continuous wave and pulsed EPR test functions. It is paired with a slit-type superconducting magnet with a maximum magnetic field of 6 T and can perform variable temperature experiments from 4-300 K.EPR-W900 has the same software operating platform as the CIQTEK X-band EPR100, providing users with a user-friendly experience.Compared with the traditional X-band EPR technology, high-frequency EPR has many advantages and has important applications in the fields of biology, chemistry, and materials.Learn More
CIQTEK EPR200M is an X-band benchtop electron paramagnetic resonance/electron spin resonance (EPR or ESR) spectroscopy. Based on its high sensitivity and stability, it offers an economical, low-maintenance, and user-friendly experience for EPR study and analysis. *Accessories: Liquid nitrogen variable temperature with cryostat; 4 mm outer diameter sample tube; Goniometer; Light system; Electrolytic cell; Flat cell.Learn More