Angular dependence of the relative final energy. The lines are for incidence energies of 210, 310, 480, 1060, 1580, and 2560 meV. The highest incidence energy is the lowest line at angles below the specular angle (40°), the other energies increase monotonically with decreasing incidence energy (at angles below specular). Note the change of slope at the incidence energy of 1060 meV.
Incidence energy dependence of the scattered angular distributions. The incidence energies are as in Fig. 1, the narrowest plot is for the highest energy, the width increases monotonically as the energy is decreased. The surface temperature is .
Surface temperature dependence of the scattered angular distributions at an incidence energy of 1060 meV. The surface temperatures are 330, 500, 600, and 800 K. The broadest distribution is at the highest temperature and the width decreases with decreasing temperature.
Experimental square root dependence of the FWHM (in degrees) of the angular distribution on the surface temperature. The experimental widths are adapted from Ref. 12 and are plotted vs. the square root of the temperature. Note that they extrapolate nicely to 0 at while if they are plotted on a linear scale as in Ref. 12 they extrapolate to a large constant (11°) which is unphysical.
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