Matter Waves
Matter Waves
Matter Waves
ENERGY
MATTER
standing-wave condition,
L =nλ/2
If an electron in the nth Bohr orbit moves
as a wave,
2πrn=nλ/2
p=h/λ=nh/(2πrn)
=nℏ/rn.
Ln=rnp=rnnℏ /rn=nℏ
This equation is the first of Bohr’s quantization conditions. Providing a
physical explanation for Bohr’s quantization condition is a convincing
theoretical argument for the existence of matter waves.
λ=2πa0=2π(0.529Å)=3.324Å
λ = where = 1
√ 1− 𝑣 2 /𝑐 2
When electrons are accelerated by a voltage V
Kinetic energy ½ m v 2 = eV
=
12.27/ V A
When accelerating voltage is 54V,
0
λ = 1.02 x10-34m/s
Λ = 1.2 A0
(3) a relativistic electron with a kinetic energy of 108 keV.
λ=hc/ KE (KE+ 2m0c2) = 3.55pm
Rest energy of electron =m0c2
=0.511 MeV
=511keV
DAVISSON GERMER EXPERIMENT
Voltage=54V
The detector used here can only detect the presence of an electron in the
form of a particle. As a result, the detector receives the electrons in the
form of an electronic current. The intensity (strength) of this electronic
current received by the detector and the scattering angle is studied. We call
this current as the electron intensity.
nλ = 2 d sin θ
What is waving in matter waves?
Probability
Of what?
Of finding the particle in a particular point at a particular time