Chapter 6, Problem 36P

Photoelectron spectra were acquired from a sample of gaseous ${\text{O}}_{\text{2}}$ using X-ray radiation with wavelength 0.99 nm and energy 1253.6 eV. The spectrum contained a large peak for photoelectrons with speed of $\text{1}.\text{57}\times \text{1}{0}^{\text{7}}{\text{m s}}^{-\text{1}}$ . Calculate the ionization energy of these electrons. Identify the orbital from which they were most likely emitted.