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Figure 2
(a) Optical density image of an STXM 9-pad pattern for damage of a ∼100 nm-thick microtomed section of PFSA. The transmission signal was measured at 694 eV (second peak in the F 1s spectrum) with 1 ms dwell time. The i signal, measured for areas on the PFSA sample but outside the 9-pads, is 1.8 (1) × 104 counts, and the i0 intensity, measured off the PFSA section, is 5.7 (2) × 104 counts. The grey scale is the optical density (absorbance, A). The scale bar is 1 µm. (b) F 1s absorbance [optical density, A(e)] spectrum of a PFSA sample [different than the one patterned in (a)], measured with STXM under no damage (red, 1) and large exposure (blue, 2) conditions. The ratio of the undamaged to damaged spectra is plotted (green, 3) (right-hand intensity scale).

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