Measurement Techniques

, Volume 55, Issue 11, pp 1287–1293 | Cite as

Determination of the difference in shielding by protons in water and hydrogen and an estimate of the absolute shielding by protons in water

IONIZING RADIATION MEASUREMENTS

The differences in the resonance frequencies of protons in water and hydrogen are determined for cylindrical samples using an electromagnet (B = 2.142 T) and a superconducting magnet (B = 11.747 T). The difference in the chemical shift for protons in water and hydrogen is found to be σ(H2) – σ(H2O) = 596(2)·10–9 at 25°C. The published value of the absolute shielding by protons in hydrogen, σ(H2) = 26288(2)·10–9 at this temperature, implies σ(H2O) = 25692(3)·10–9, which differs from the shielding by protons in water σ(H2O) = 25694(14)·10–9 given in lists of the fundamental physical constants.

Keywords

fundamental physical constants correction for magnetic shielding by protons in water 

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  1. 1.Mendeleev All-Russia Research Institute of Metrology (VNIIM)St. PetersburgRussia
  2. 2.St. Petersburg National Research University for Information Technologies, Mechanics, and OpticsSt. PetersburgRussia

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