Field Emission Energy Distributions of Hydrogen and Deuterium on the (100) and (110) Planes of Tungsten

Total energy distributions of field emitted electrons from the tungsten (110) and (100) planes as a function of coverage by hydrogen and deuterium have been recorded utilizing a spherical deflection energy analyzer. The elastic tunneling resonance spectrum gives a plot of the “local density of states” in the adsorbate. The inelastic tunneling spectrum reveals those discrete excitation energies available in the adsorbate–substrate complex. These spectroscopic data have been used to infer the chemical nature of the binding states which have been observed in the flash desorption spectrum of hydrogen from tungsten.