The surface
coverage of CO molecules obtained is θ = 0.069
Rationale
Firstly we need to calculate the incident flux of CO using the Hertz-Knudsen formula : this gives
F = 3.83 x 10^{16} molecules m^{-2} s^{-1}
Since the sticking probability is constant, the number of molecules per m^{2} is simply given by
Coverage | = F x S x t |
= 3.83 x 10^{16} x 0.9 x 20 | |
= 6.90 x 10^{17} molecules m^{-2} |
which, when ratioed to the surface density of substrate atoms, gives
θ = 6.90x10^{17} / 1.0x10^{19} ⇒ θ = 0.069