1. A coupon of very pure Gold and highly clean surface isexposed to an Argon Fluoride (ArF) excimer laser beam of wavelength193.4±0.2 nm inside an ESCA (Electron Spectroscopy for ChemicalAnalysis) ultrahigh vacuum spectrometer. The coupon surface facesthe entrance aperture of a hemispherical electrostatic energyanalyzer and detector. The coupon and the analyzer entranceaperture are electrically connected together at ground potential(zero Volts). A fraction of the photo-emitted electrons enters theanalyzer and their energy distribution is measured. a) (2 points)What is the energy of a photon in the ArF laser beam expressed inelectron-Volts (eV)? b) (2 points) The highest energy of thedetected electrons was 1.3±0.1 eV. What was the Work Function ofthis Gold surface in eV?
