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Medical Forum / General / General / November 2004Can magnetic resonance be optically detected in room temperature?
I have great interest on optically detected magnetic resonance. It is based on electron spin resonance technique, while detecting the change of photon instead of microwave. From the literatures I collected so far, I found all the experiments were done at pretty low temperature, normally less than 100K. Can magnetic resonance be optically detected in room temperature? And by the way, is there any relation between the sample temperature and signal-to-noise ratio or sensitivity? Thanks a million! > I have great interest on optically detected magnetic resonance. It is > based on electron spin resonance technique, while detecting the change [quoted text clipped - 8 lines] > > Thanks a million! Would you be interested in the reverse process, i.e. detecting optical absorption by its effect on a microwave (X band, 10 GHz) spin resonance transition, at room temperature? > > I have great interest on optically detected magnetic resonance. It is > > based on electron spin resonance technique, while detecting the change [quoted text clipped - 12 lines] > absorption by its effect on a microwave (X band, 10 GHz) spin resonance > transition, at room temperature? I 'd like to try both since my system would be able to detect EPR signal and optical signal both. The question is, according to many literatures, since photon takes much more energy than microwave, monitoring EPR by detecting light absorption/scattering should be much more sensitive than monitoring light absorption by detecting EPR signal. If true, what is the merit of the latter? Thank you! > > > I have great interest on optically detected magnetic resonance. It is > > > based on electron spin resonance technique, while detecting the change [quoted text clipped - 20 lines] > light absorption by detecting EPR signal. If true, what is the merit > of the latter? My interest in it was purely as a demonstration experiment, for teaching purposes. Make an X-band microwave cavity filled with ruby; sweep the input microwave frequency across the ruby resonance and display the X-band resonance on a scope; fire a ruby laser (or possibly a chopped UV source) into the ruby; watch the X-band magnetic resonance change and then recover. > My interest in it was purely as a demonstration experiment, for teaching > purposes. Make an X-band microwave cavity filled with ruby; sweep the > input microwave frequency across the ruby resonance and display the > X-band resonance on a scope; fire a ruby laser (or possibly a chopped UV > source) into the ruby; watch the X-band magnetic resonance change and > then recover. Got it. Thank you very much! > I have great interest on optically detected magnetic resonance. It is > based on electron spin resonance technique, while detecting the change [quoted text clipped - 8 lines] > > Thanks a million! I'm not sure it's the sort of experiment you had in mind, but standard optical pumping experiments seem to meet your criterion--magnetic resonance induced by rf or microwave magnetic fields, but detected by change in transmission of a sample for light. And the technique certainly works at normal temperatures--say 50 Celsius for rubidium vapor, using 795 nm resonance line for polarizing and probing the sample. Signal to noise ratio rises as the sample gets denser, then drops as it gets too opaque. D. Van Baak > I'm not sure it's the sort of experiment you had in mind, but standard > optical pumping experiments seem to meet your criterion--magnetic [quoted text clipped - 4 lines] > sample. Signal to noise ratio rises as the sample gets denser, then > drops as it gets too opaque. Can I use solid instead of vapor in room temperature? I suppose the use of vapor is because that the linewidth is not significantly broadened by the solid lattices. However, I did see some researchers succeeded to optically detect EPR of Ruby at tens of K. Can I apply the same system to room temperature? Thank you! |
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