Illustrated Glossary of Organic Chemistry
Spin
quantum
number (
I
):
The position of the
nuclear spin axis
relative to the
applied magnetic field
B
0
. (This is a greatly simplified, but for the purposes of an introductory study of
NMR spectroscopy
, a conceptually useful interpretation. A more rigorous definition involves
nuclear spin
angular momentum. See the
Wikipedia
for more detail.)
I
= +1/2
Nuclear spin axis
(in red) and
B
0
parallel
Ground state
Release energy
(
Relaxation
)
Add energy
(
Excitation
)
I
= -1/2
Nuclear spin axis
(in red) and
B
0
antiparallel
Excited state
Related terms:
Excitation
,
relaxation
,
spin-spin coupling
,
splitting
Wikipedia entry
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