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NMR**2 Talk: Low Field at LANL - Coggle Diagram
NMR**2 Talk:
Low Field at LANL
DNP-NQR / ODNP
NQR Measurements and
1H-14N transfers in melamine
Need a large volume resonator to do e- irradiation freq. given by NQR frequency
Large volume max frequency gets capped very quickly by lambda/4
Early attempts based on
two coil designs for 1.5 GHz by Gor'kov
of course these dimensions are incompatible
Thanks to Gor'kov:
slotted tube (early) or birdcage resonator
"array" of inductive loops allows
higher frequencies without hitting bad geometries
Systematically optimized the design with EM simulations
Found an arrangement with
maximum B1 for a length of ca. 15 cm
volume = ## mL
Can stack two of these for a total length/ volume = ##
3 dBm loss is not so bad since gamma.B1 scales with P**2
Measured heating ......
Earth's Field NMR
Spectrometer Description
Previous work in detecting warfare agents
Interested in detecting illicit materials
often contain 14N (explosives + opioids)
Systematic study on the
effects of 14N broadening at ULF
Expands on Pople's work for strong coupling regime
See huge influence w/ vs,. w/o 14N coupling
Extension to fluorofentanyl