Mean of the data of

O.V. Rattigan, D.E. Shallcross, and R.A. Cox, "UV absorption cross-sections and atmospheric photolysis rates of CF₃I, CH₃I, C₂H₅I and CH₂ICl," J. Chem. Soc. Faraday Trans. 93, 2839-2846 (1997); DOI: 10.1039/A701529A, and

C.M. Roehl, J.B. Burkholder, G.K. Moortgat, A.R. Ravishankara, and P.J. Crutzen, "Temperature dependence of UV absorption cross sections and atmospheric implications of several alkyl iodides," J. Geophys. Res. 102(D11), 12819-12829 (1997); DOI: 10.1029/97JD00530

The temperature dependence ln σ(T) = ln σ(298K) + B × (T - 298) and the temperature coefficients B (243-333 K):

------------------
λ  10³ B
(nm) (K^-1)
-----------------
235  0.24
240  0.12
245 -0.02
250 -0.11
255 -0.28
260 -0.44
265 -0.55
270 -0.59
275 -0.47
280 -0.18
285  0.32
290  0.99
295  1.73
300  2.56
305  3.08
310  3.50
315  3.56
320  3.46
325  3.44
330  3.72
335  4.09
340  4.87
345  5.69
350  6.88
355  8.16
360  9.01
365 11.06
370 11.47
375 12.77
380 15.14
385 19.12
390 20.48

are adopted from the work of Rattigan et al. (1997)