Chapter 12, Problem 12B.5AE

(i)

Interpretation Introduction

Interpretation:

The difference in local magnetic field when applied magnetic field is $1.5\text{T}$ is to be stated.

Concept introduction:

Many nuclei and electrons have spin, due to this spin magnetic moment arises.  The energy of this magnetic moment depends on the orientation of the applied magnetic field.  In NMR spectroscopy, every nucleus has a spin.  There is an angular momentum related to the spin.  The difference between its resonance frequency and that of reference standard is known as the chemical shift of a nucleus.  Tetramethylsilane is taken as reference.  All nuclei experience different applied magnetic field due to varying chemical environment.  Local field is the field experienced by the nuclei that is completely different from the applied magnetic field.

(ii)

Interpretation Introduction

Interpretation:

The difference in local magnetic field when applied magnetic field is $15\text{T}$ is to be stated.

Concept introduction:

Many nuclei and electrons have spin, due to this spin magnetic moment arises.  The energy of this magnetic moment depends on the orientation of the applied magnetic field.  In NMR spectroscopy, every nucleus has a spin.  There is an angular momentum related to the spin.  The difference between its resonance frequency and that of reference standard is known as the chemical shift of a nucleus.  Tetramethylsilane is taken as reference.  All nuclei experience different applied magnetic field due to varying chemical environment.  Local field is the field experienced by the nuclei that is completely different from the applied magnetic field.