Ionization Energy?

Question

N2 + ƛ --> N2(+) + e(-)

Wavelength (ƛ in nm) = 80.1

Calculate the ionization energy

Answer 1

To me, this doesn't seem like a complete question.

Ionization energy seems like something that is empirically determined, not calculated.  Perhaps what you are supposed to calculate is the amount of radiation to deliver that is needed to ionize a specific quantity of N2?  While you have the wavelength, however, you don't know the absorption efficiency of N2 at that wavelength or the amount of N2 you are working with.

Without those numbers, I don't see how to calculate the amount of radiation you need to deliver in order to ionize the gas.

Maybe I just don't get it though.  Did you try posting this in physics and chemistry to see if you get a better answer?