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(1)

NMR (nuclear magnetic resonance) field with very broad applications

pl. organic-inorganic chemistry, physics, biology, medical appl.

different, problem oriented construction of devices

HERE:

structrure elucidation of SMALL molecules (M<1000), liquid phase

(2)

SPIN!

(3)

spin ~ tiny rotating compass!

Larmor

precession

dm/dt = m × B

(4)

N

S B0

(5)

N

S S

N

B0 M B0 M

(6)
(7)

S N

M

B0 termic equilibrium

(8)

S N

M B0

Larmor

precession

w0 = gB0

MHz!

dM/dt = M × B

(9)

How to tilt away M?

with an w1 ~ w0 RF radiation

B0 w0

w1

(10)

B0 pulse radiation!

(11)

B0

(12)

B0

Larmor precession+ relaxation

(13)

B0

(14)

B0

(15)

B0

(16)

B0

(17)

B0

(18)

B0

(19)

B0

(20)

B0

FT

w

w0 = gB0(1- s)

Chemical shift!

t

w0

(21)
(22)

S N

M B0

(23)

S N

M B0

(24)

B0

t

w

FT

w0 w0 = gB0(1- s)

w0

(25)

B0

w0 w0

(26)

w0 w0

w0 w0

FT

w0 w0

(27)

f(t)

F(w)

−

w

=

−

w f t e dt F ( ) ( )

i t

FT

FID= Free Induction Decay

Hivatkozások

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