Figure. 6.
Comparison of diffusion approximation of LEBS with Monte Carlo simulations utilizing various phase functions. In panel a, the LEBS peak width agrees with the diffusion approximation for ls* < LSC. At ls* >> LSC, the diffusion approximation is no longer accurate because it is not a good model for p(r) for r<ls*. A comparison between the Mie and Henyey Greenstein phase function for the same value of g indicates that the accuracy of the phase function is important for modeling the LEBS peak width. In panel b, the same data are shown as in panel a, but simulated for a spectrometer based LEBS measurement where the spectrometer slit is of angular width 1.3α. In this case, the sensitivity due to varying phase functions at ls*>>LSC becomes more pronounced.