Nuclear radius Flashcards
1
Q
How does electron diffraction occur?
A
- beam of high energy electrons
- directed at a thin solid sample of an element
- diffracted by nuclei
2
Q
How is the beam of electrons produced?
A
- accelerating electrons through a pd of the order of a hundred million volts
3
Q
How are the electrons diffracted?
A
- the de Broglie wavelength of such high energy electrons is of the order of 10-15
- this is about the same as the diameter of the nucleus
4
Q
WHat is the detector used to measure?
A
- the number of electrons per second diffracted through different angles
5
Q
What do the measurements show as the angle of the detector is increased?
A
- intensity decreases then slightly increases then decreases again
6
Q
How does scattering of the beam occur?
A
- due to their charge
- attracted to nuclei
- this causes the intensity to decrease
7
Q
Why do the results slightly increase in intensity?
A
- maxima and minima to be superimposed
- only happens when de Broglie wavelength is not greater than the dimension of the nucleus