the germer expirement a. (essay) Explain in 2-3 sentences how you could set up a

Question

the germer expirement

a. (essay) Explain in 2-3
sentences how you could set up an experimental apparatus to measure the surface
structure of the chunks.

b. Explain in 2-3 sentences
how you would tell if the surface atoms were randomly arranged without any
pattern (known by the technical term as amorphous) or if they were arranged in
a regular crystalline structure.

c. For surfaces that have crystalline
structure, explain how you would determine the spacing D between the atoms in
the crystal. Be specific, include the main ideas (use the Davisson Germer
simulation to help you better understand the main ideas) and, using Bragg

Explanation / Answer

a) after surface prepearation we illuminate the surface with a radiation of specific wavelength(lambda)

we record the intensity of the reflected rays.....

by plotting the intensity vs angle we determine the lattice parameter,D-spacing, etc....

b) we will do X-ray diffaction of the sample...

if the diffraction pattern gives specific peaks...then it is crystalline

otherwise it is amorphous material

c) the diffraction pattern gives us the value of 2*theta

now according to braggs law

2*d*sin(theta)=lambda

==> D=lambda/2*sin(theta)

we know theta from the experiment

lambda is known

so we can calculate the D-spacing between the planes.......

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