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Figure 3
High-intensity pulse-height histogram. Dashed line is the histogram of digitized APD pulses recording a higher rate of air-scattered X-rays (achieved by moving the APD closer to the 8 keV synchrotron beam). These data are modeled by a series of peaks containing from one up to nine photons per bunch, equally spaced and with linearly increasing widths (see text). The relative amplitudes are fixed by assuming Poisson statistics. The solid line is the best fit to the data obtained by setting λ = 3.8. Inset: digitized amplifier output for a 2 ms time window. |