Question

Ultraviolet photoelectron spectroscopy (UPS) is an important analytical tool used to characterize the composition of materials in academic, industrial and national laboratories. The technique relies on the photoelectric effect where-in electrons are emitted from a material when it absorbs ultraviolet photons. Make a plot of the kinetic energy of the photo-emitted electrons versus the frequency of the incident light as the frequency is varied across the transition where photon energy exceeds the ionization energy (IE) of a material being examined by UPS. Label you axes.

Answer 1

The equation for the Kinetic Energy,
`KE_e`, of the photo-emitted electrons is given as follows;

`KE_e = h\cdot f- BE`

Please find attached the required plot of the kinetic energy versus the frequency

Step-by-step explanation:

The equation for the Kinetic Energy,
`KE_e`, of the photo-emitted electrons is given as follows;

`KE_e = h\cdot f- BE`

Where:

h = Planck's constant = 6.63×10⁻³⁴ J·s

f = Frequency

BE = Binding Energy = 2.71 eV for Calcium metal

f₀ = Threshold frequency for the material

The ionization energy is the energy required to free an electron from an isolated atom