Dieter Suter: "Magnetic resonance with small samples: principles and applications"
von 11:15 bis 12:00
|Wo||FRIAS Seminar Room, Albertstr. 19, 79104 Freiburg|
|Kontakttelefon||+49 761 203 97418|
Open to University members
Department of Physics, TU Dortmund, Germany
Magnetic resonance with small samples: principles and applications
Magnetic resonance provides valuable information on virtually every type of material, in physics, chemistry, medicine and other fields. In many applications, its usefulness is only limited by its inherently low sensitivity. If the amount of available sample is limited, it becomes difficult to acquire a signal that exceeds the thermal noise of the detector. In these cases, it is often possible to increase the signal by several orders of magnitude by adapting the resonator to the available sample. We show examples from NMR and EPR, where miniaturized resonators allow one to measure samples with dimensions in the nanometer to micrometer range. Another possible approach consists in increasing the polarization, e.g. by optical pumping, and / or using detection techniques that do not rely on Faraday´s law of induction.