The experimental apparatus consisted of a 30 W D₂ lamp, a jacketed single pass absorption cell with a 90.4 cm pathlength, a 0.25 m monochromator with a photomultiplier tube detector

Parameterization of the temperature dependence valid over the 190−235 nm wavelength range and 210−320 K temperature range:

ln(σ(λ, T)) = Σ A_i λⁱ + (T - 296) × Σ B_i λⁱ (i = 0 - 4)

with the following parameters A_i and B_i:

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i    A_i        B_i
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0  315.204     0.00077
1  -8.03836     -5.6975×10^-4
2  0.006362234    1.1304×10^-5
3    -2.1356×10^-4   −7.3977×10^-8
4  2.5779×10^-7       1.52790×10^-10