Choose another division
Electrical semiconductor characterization
Luminescence dating, research, dosimetry and more
Free radical measurements in life science and biomedical applications
Our benchtop MiniScope (MS 5000) ESR spectrometer is a research grade device with sensitivity and reliability for demanding...
The MS 6000 is a research device with high-end sensitivity for sophisticated applications in field of science & technology.
Industry standard for evaluating irradiation doses of alanine pellets and blisters
Nitric oxide measurement, reactive oxygen species, oxidative stress, Proteine structure & enzyme function
Antioxidative features of foodstuff, Food irradiation control, Flavour stability, Beer analysis
Analysis of chemical structure of paramagnetic centers and their orientation within a crystal
Transition metal compounds, Effects of heavy metal ions on living tissue, etc.
A variety of free radicals is formed through pollutants such as particulate matter, nanoparticles or others
Asphaltenes in crude oil, Thermooxidative breakdown of lubricants, Polymerization control
Quality control of pharmaceuticals and impurity profiling
Spin density, Kinetic measurements
ESRStudio is a dynamic and user friendly software for ESR measurements with some of the most modern and fluent workflow based...
Magnettech GmbH was founded in 1991 by the members of the department of "Centre for Construction of Scientific Devices"...
For Sales, Technical Support, Service and other General Enquiries
Fig. 1: magnetic field strength of the microwave in the TE102 cavity with two dielectric rings
Fig. 2.b: EPR signals of Mn with none, one and two dielectric rings
Fig. 2.a: EPR signals of Tempol with none, one and two dielectric rings
For a lot of EPR applications the sensitivity of the measurement tool is vital for good results, e.g. low dose dosimetry. In this application note it is described how the sensitivity of the MS5000 was enhanced by a factor of 4 for solids and factor 2 for liquid samples by concentrating the magnetic field of the microwave at the sample location through dielectric rings.
In the MS5000 a rectangular cavity with a TE102 mode at 9.2…9.6 GHz is used, which is ideal for multifunctional use. By inserting two dielectric rings (e » 30) the magnetic field of the microwave can be concentrated at the sample location and hence the fill factor rises. Figure 1 shows the simulated magnetic field strength in the cavity.
Since also the electric field is concentrated, the coupling of the cavity with liquid samples can be difficult, but since the accuracy of the coupling has been improved in the MS5000 recently, it is possible to couple up to 100 µl with the dielectric rings.
Figure 2.a and 2.b demonstrates the improved sensitivity on Mn (solid) and Tempol (liquid) for one and two dielectric rings. It becomes obvious that the sensitivity is improved by a factor of 4 for solids and a factor 2 for liquids.
Bench-Top ESR Spectrometer