ISO_NWIPs-for-Ballot

ISO/NP

Note 1 to entry: The resonance among nuclear spins in a magnetic field is based on the transition between their 72 energy levels, arising from interactions between the spins and the static magnetic field. 73 3.2 74 quantitative NMR 75 qNMR 76 quantitative analysis using NMR spectroscopy 77 3.3 78 1 H quantitative NMR 79 1 H qNMR 80 quantitative NMR spectroscopy using hydrogens ( 1 H) as the observed nucleus 81 3.4 82 Resonance 83 Signal of a certain nucleus in an NMR spectrum 84 3.5 85 Signal 86 resonance peak in an NMR spectrum 87 3.6 88 radio frequency 89 RF 90 electromagnetic radiation with a frequency in the range of 300 Hz to 3 THz 91 Note 1 to entry: The RF used for 1 H NMR is in the range of several tens of to about one thousand MHz 92 93 3.7 94 nuclear spin 95 property describing the magnetic moment of a nucleus 96 Note 1 to entry: It can also be described as the spin magnetic moment of a nucleus. 97 98 3.8 99 static magnetic field 100 magnetic field that does not vary over time 101 3.9 102 external magnetic field 103 magnetic field applied to the NMR apparatus from an outside source 104 3.10 105 gyromagnetic ratio 106 natural constant, unique for each nuclear species, that is the ratio of its magnetic moment to its angular 107 momentum 108 Note 1 to entry: The gyromagnetic ratio reflects the angular frequency of the precession of the atomic nuclei in a 109 magnetic field. 110 3.11 111 relaxation 112 A process of a nucleus returning to a state of thermal equilibrium after it has been excited by radio 113 frequency 114

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