In this work, we have continued with development of the techniques set forth in. At NIST, a project is underway to use our two fully-traceable x-ray energy spectrometers to measure a wide range of x-ray lines which can be used to calibrate TES devices, which have the potential of high-throughput, high-accuracy XRF measurements. Modern developments in superconducting transition-edge sensors (TES) for energy-dispersive XRF measurements will allow very high precision, but such devices require calibration against very well known lines, and both the shape and position of observed lines need to be monitored. Current applications of both XRD and XRF are beginning to demand higher quality line shapes and positions to allow fitting of spectra, particularly those that include KM and KN lines, which can be shifted by chemical effects. However, for lines which have complex shapes, this parametrization may not fully contain the information of the underlying measurement. This has been sufficient for most x-ray diffraction (XRD) purposes and for the current applications of x-ray fluorescence (XRF). Previous best-practice publications of such information have presented parametrized fits to sums of Lorentzian peaks or, often, the position of the measured brightest point on the spectrum. Electrons are ejected from a metallic surface with speeds of up to 4.6 x 105 m/s when light with a wavelength of 625 nm is used.Accurately-measured x-ray emission spectra from electron-bombarded targets are critical for a wide variety of metrological and analytical applications. a) Based on this measurement, what is the work function for this metal? b) What stopping potential would be observed when using the yellow light from a helium discharge tube ( = 587.5 nm)? 4. When green light from a mercury lamp (546.1 nm) is used, a stopping potential of 0.376 V reduces the photocurrent to zero. Two light sources are used in a photoelectric experiment to determine the work function for a particular metal surface. b) What is the lowest frequency of light incident on zinc that releases photoelectrons from its surface? c) If photons of energy 5.50 eV are incident on zinc, what is the maximum kinetic energy of the ejected photoelectrons? 3. b) What is the stopping potential if the incident light has a wavelength of 180 nm? 2.

a) Find the cutoff wavelength and cutoff frequency for the photoelectric effect.

Molybdenum has a work function of 4.20 eV.

Cut off wavelength equation molybdenum