Figure 2.8 shows the spectrum of ozone between wavelengths of 240 and 300 [nm]. At
the maximum of 255 [nm] the absorption cross section is about 10−17 [cm2]; it is about
half maximum at 275 [nm] and has decreased to about 10% of its maximum value by
290 [nm]. That ozone forms a very thin shield indeed, is probably best demonstrated by the
fact that the amount of O3 in the atmosphere corresponds to a layer of 0.3 [cm] at standard
temperature and pressure (Exercise 2.9).
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