Ultra-violet photoemission studies of CO, N2 and C adsorbed on W(100)

Abstract

Ultra-violet photoelectron spectra are reported for C, CO and N₂, and mixtures of these, adsorbed on W(100) at room temperature. The results have been compared with simultaneous flash desorption and work function measurements, and with known LEED data for the same adsorption systems. Sequential removal of the β-desorption states of N₂ and CO results in marked changes in the photoelectron spectrum, demonstrating considerable surface rearrangement during the temperature flash. Comparison of the spectra of the c(2 × 2) adsorbate structures of C, CO and N₂, and also of higher coverages, including mixtures, suggests that the adsorbate spectra are determined more by the structure of the adsorbed layer than by its chemical nature.