The earlier recommendations for the absorption cross sections (JPL-2002, JPL-2006, and JPL-2010) habe benn adopted

170-180 nm, mean of the data of

C. Hubrich and F. Stuhl, "Ultraviolet absorption of some halogenated methanes and ethanes of atmospheric interest," J. Photochem. 12, 93-107 (1980); DOI: 10.1016/0047-2670(80)85031-3, and

A.K. Nayak, M.J. Kurylo, and A. Fahr, "UV absorption cross sections of methylchloroform: Temperature-dependent gas and liquid phase measurements," J. Geophys. Res. 100(D6), 11185-11189 (1995); DOI: 10.1029/95JD00695,

185-205 nm, mean of the data of

N. Vanlaethem-Meurée, J. Wisemberg, and P.C. Simon, "Ultraviolet absorption spectrum of methylchloroform in the vapor phase," Geophys. Res. Lett. 6, 451-454 (1979); DOI: 10.1029/GL006i006p00451 ,

C. Hubrich and F. Stuhl, "Ultraviolet absorption of some halogenated methanes and ethanes of atmospheric interest," J. Photochem. 12, 93-107 (1980); DOI: 10.1016/0047-2670(80)85031-3, and

A.K. Nayak, M.J. Kurylo, and A. Fahr, "UV absorption cross sections of methylchloroform: Temperature-dependent gas and liquid phase measurements," J. Geophys. Res. 100(D6), 11185-11189 (1995); DOI: 10.1029/95JD00695,

210-240 nm, mean of the data

N. Vanlaethem-Meurée, J. Wisemberg, and P.C. Simon, "Ultraviolet absorption spectrum of methylchloroform in the vapor phase," Geophys. Res. Lett. 6, 451-454 (1979); DOI: 10.1029/GL006i006p00451, and

A.K. Nayak, M.J. Kurylo, and A. Fahr, "UV absorption cross sections of methylchloroform: Temperature-dependent gas and liquid phase measurements," J. Geophys. Res. 100(D6), 11185-11189 (1995); DOI: 10.1029/95JD00695,

245-255 nm, extrapolation of the 210-240-nm data, log σ(λ) = -1.59792 - 0.08066 λ

The parameterization of the cross section temperature dependence (210-300 K, 182-240 nm) using an empirical polynomial expansion

log₁₀ σ(λ, T) = ∑A_n λⁿ + (T–273) × ∑B_nλⁿ

with the following parameters A_n and B_n reported by

D. Gillotay and P. C. Simon, "Ultraviolet absorption cross-sections of photoactive species of stratospheric interest. Part 1 : The Halocarbons", Aeronomica Acta A, 356, 1-173 (1990):

A₀ = 341.085191         B₀ = –1.660090
A₁ = –7.273362        B₁ = 3.079969 × 10–2
A₂ = 5.498387 × 10^–2       B₂ = –2.106719 × 10^–4
A₃ = –1.827552 × 10^–4        B₃ = 6.264984 × 10^–7
A₄ = 2.238640 × 10^–7       B₄ = –6.781342 × 10^–10

is recommended