davisson-germer experimentdavisson-germer...

Seoul National University NRL HoloTech

Fig. 5-4, p. 156

Davisson-Germer ExperimentDavisson-Germer Experiment


Fig. 5-5, p. 156


Fig. 5-6, p. 157


Fig. 5-7, p. 157 Fig. 5-8, p. 158


The Nobel Prize in Physics 1986The Nobel Prize in Physics 1986

Ernst Ruska (1906-1988)

“for his fundamental work in electron optics, and for the design of the first electron microscope”

“for their design of the scanning tunneling microscope”

Gerd Binnig(1947-)

Heinrich Rohrer (1933-)


Electron Microscopes – TEM, SEMElectron Microscopes – TEM, SEM

Fig. 5-11, p. 160Fig. 5-10, p. 160


Fig. 5-12, p. 161


Fig. 5-13, p. 162


Fig. 5-15, p. 163


Fig. 5-14, p. 162


Fig. 5-16, p. 163Atomic Force Microscope (AFM) image


Fig. 5-17, p. 164

Wave PacketWave Packet


Fig. 5-18, p. 165

( ) ( )

( ) ( ) ( ) ( )

1 2 1 1 2 2

2 1 2 1 2 1 2 1

cos cos

1 12 cos cos2 2

y y y A k x t A k x t

A k k x t k k x t

ω ω

ω ω ω ω

= + = − + −

⎛ ⎞ ⎛ ⎞⎡ ⎤ ⎡ ⎤= − − − + − +⎜ ⎟ ⎜ ⎟⎣ ⎦ ⎣ ⎦⎝ ⎠ ⎝ ⎠


Fig. 5-19, p. 166


Phase Velocity & Group VelocityPhase Velocity & Group Velocity

0

p

gk

vkdvdk

ω

ω

=

=


Fourier Transform & Inverse FTFourier Transform & Inverse FT

1( ) ( )21( ) ( )2

ikx

ikx

f x a k e dk

a k f x e dx

π

π

∞

−∞

∞ −

−∞

=

=

∫

∫


Fig. 5-21, p. 171


Fig. 5-22, p. 171


Fig. 5-23, p. 172


Fig. 5-24, p. 173


Widths in Fourier RepresentationWidths in Fourier Representation

k xtω

Δ Δ

Δ Δ

와 는반비례

와 는반비례

Uncertainty Principle (불확정성의 원리)

Gaussian wave packet:12

x kΔ Δ =

Minimum!

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