170-264 nm, JPL-2002, JPL-2006, and JPL-2010 recommendations adopted

170-186 nm, data of

D. Gillotay, P.C. Simon, and L. Dierckx, "Temperature dependence of ultraviolet absorption cross-sections of brominated methanes and ethanes," Aeronomica Acta A 335, 1-25 (1988),

188-194 nm,

values estimated by smoothing the absorption curve,

196-264 nm, mean of the values of

L.T. Molina, M.J. Molina, and F.S. Rowland, "Ultraviolet absorption cross sections of several brominated methanes and ethanes of atmospheric interest," J. Phys. Chem. 86, 2672-2676 (1982); DOI: 10.1021/j100211a023,

D. Gillotay, P.C. Simon, and L. Dierckx, "Temperature dependence of ultraviolet absorption cross-sections of brominated methanes and ethanes," Aeronomica Acta A 335, 1-25 (1988),

J.B. Burkholder, R.R. Wilson, T. Gierczak, R. Talukdar, S.A. McKeen, J.J. Orlando, G.L. Vaghjiani, and A.R. Ravishankara, "Atmospheric fate of CF₃Br, CF₂Br₂, CF₂ClBr, and CF₂BrCF₂Br," J. Geophys. Res. 96(D3), 5025-5043 (1991); DOI: 10.1029/90JD02735, and

L. Orkin and E.E. Kasimovskaya, "Ultraviolet absorption spectra of some Br-containing haloalkanes," J. Atmos. Chem. 21, 1-11 (1995); DOI: 10.1007/BF00712435,

266-350 nm, parameterization of

D.K. Papanastasiou, N. Rontu Carlon, A. Neuman, E.L. Fleming, C.H. Jackman, and J.B. Burkholder, "Revised UV absorption spectra, ozone depletion potentials, and global warming potentials for the ozone-depleting substances CF₂Br₂, CF₂ClBr, and CF₂BrCF₂Br", Geophys. Res. Lett. 40, 464-469 (2013); DOI: 10.1002/grl.50121,

with values at λ ≥ 322 nm obtained by an extrapolation

The recommended parameterization of the cross section temperature dependence: for wavelengths > 264 nm is taken from Papanastasiou et al.:

ln (σ(λ,T)) = ∑_i A_i (λ-λ*)ⁱ × [1 + (296 – T) ∑_i B_i (λ-λ*)ⁱ]

with the following parameters A_i and B_i and λ* = 274.64 nm:

-----------------------------------------------------
i    A_i        B_i
-----------------------------------------------------

0  -48.3611     0.0001877
1  -0.1595      7.252×10^-6
2  -1.026×10^-4     2.917×10^-7
3  -1.334×10^-5   -1.725×10^-9
4   1.458×10^-7      -2.675×10^-11