Name _________________________
Exam 3, 2008:
CHEM/BCMB 4190/6190/8189
1
Exam 3:
CHEM/BCMB 4190/6190/8189 (129 points)
Thursday, 30 October, 2008
1
).
In the example (right), the effect of a 90
°
(
±
/2) pulse
applied along the “
x
” axis (90
°
x
) is shown for a bulk
magnetization vector (
M
0
) at equilibrium (on the ‘
z
’ axis).
For ‘c’, ‘d’ and ‘e’ below, show the effects of the indicated
pulses by drawing the missing (originating or resulting)
vectors on the coordinate axes.
For ‘a’, ‘b’ and ‘f’, fill in
the blank with the correct pulse (angle and axis along
which it is applied) that will promote the indicated
movement of the bulk magnetization vector.
In some cases
there may be more than one correct answer.
(12 points)
a.
d.
b.
e.
c.
f.
90
°
x
M
0
y
z
x
y
z
x
90
°

y
y
z
x
y
z
x
90
°

x
y
z
x
y
z
x
90°
²
y
,
90°
x
y
z
x
y
z
x
y
z
x
y
z
x
270
°
y
, 90
°

x
180
°
x
y
z
x
y
z
x
y
z
x
y
z
x
±

y
this vector is in
the xz plane
this vector is in
the xz plane
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