Andrew Casey (2007) Nuclear magnetic resonance on room temperature samples in nanotesla fields using a two-stage dc superconducting quantum interference device sensor. Applied Physics Letters, 91 (14). pp. . ISSN 1077-3118
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We describe a compact system for pulsed nuclear magnetic resonance at ultralow magnetic fields on small liquid samples ( ∼ 0.14 ml) at room temperature. The broadband spectrometer employs an integrated two-stage superconducting quantum interference device current sensor with a coupled energy sensitivity of 50h, in the white noise limit. Environmental noise is screened using a compact arrangement of mu-metal and a superconducting shield. Proton signals in water have been observed down to 93 nT (a Larmor frequency of 4.0 Hz), with a minimum linewidth of 0.16 Hz measured at ∼ 40 Hz. Two-component free induction decays were observed from oil/water mixtures between 275 and 300 K.
This is a Published version This version's date is: 01/10/2007 This item is peer reviewed
https://repository.royalholloway.ac.uk/items/72711da4-7718-0925-62ff-181e79dd611f/1/
Deposited by () on 20-Jan-2011 in Royal Holloway Research Online.Last modified on 20-Jan-2011
(C) 2007 American Institute of Physics, whose permission to mount this version for private study and research is acknowledged.