Small Organic Peroxy Radicals – Table 12

Figure 10. Recommended Absorption Cross Sections

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Table 12. Recommended Absorption Cross Sections.a

Wavelength(nm) Absorption Cross Sections (base e, 10-18 cm2molecule-1)
HO2 CH3O2 C2H5O2 CH3C(O)O2
190 3.68
195 4.02 3.89
200 4.23 5.64
205 4.27 1.65 6.65
210 4.15 2.19 1.95 6.56
215 3.85 2.76 2.57 5.64
220 3.41 3.30 3.19 4.51
225 2.88 3.76 3.74 3.66
230 2.30 4.08 4.18 3.26
235 1.73 4.24 4.44 3.19
240 1.22 4.24 4.52 3.26
245 0.797 4.07 4.40 3.30
250 0.480 3.78 4.12 3.22
255 0.263 3.39 3.72 3.00
260 0.129 2.94 3.24 2.68
265 2.48 2.73 2.29
270 2.03 2.22 1.87
275 1.62 1.76 1.47
280 1.26 1.36 1.11
285 0.961 1.02 0.812
290 0.715 0.746 0.573
295 0.520 0.533
300 0.373

a) Fit Parameters used in calculating the cross sections; note that the fits are only valid for the range in which cross sections are given in the table. See JGR paper for appropriate equations.

HO2 (Eq. 2) σmed = 1.64 × 10-18, νmed = 50260, a = 4.91, b = 30612
CH3O2 (Eq. 1) σmax = 4.26 × 10-18, λmax = 237.3, a = 44.4
C2H5O2 (Eq. 1) σmax = 4.52 × 10-18, λmax = 239.4, a = 49.0
CH3C(O)O2 (Eq. 3) σmax1 = 6.29 × 10-18, λmax1 = 206.0, a1 = 168, σmax2 = 3.26 × 10-18, λmax2 = ?246.1, a2 = 64.2