http://en.wikipedia.org/wiki/Earth's_field_NMR
However in the Earth's magnetic field the same nuclei resonate at audio frequencies of around 2 kHz, generating very weak signals. Thus proton (hydrogen nucleus) EFNMR frequencies are audio frequencies of about 1.3 kHz near the Equator to 2.5 kHz near the Poles, around 2 kHz being typical of mid-latitudes
04.12.06
17:00 Graduiertenkolleg Magnetische Resonanz
Dr. S. Appelt, FZ Jülich
Mobile ultra high resolution Nuclear Magnetic Resonance Spectroscopy in Earth´s magnetic field
Uni, NWZ II, Pfaffenwaldring 57, Raum V 57.04
Beispielbild:
http://www.magritek.com/terranova.html
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