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Entries from:

PAC, 1985, 57, 105. Names, symbols, definitions and units of quantities in optical spectroscopy (Recommendations 1984), doi:10.1351/pac198557010105

absorptance, α
decadic absorbance, A
optical spectroscopy
spectral radiant power, P λ
specular reflectance (reflection factor), ρ in optical spectroscopy
total radiant power
wavelength, λ
wavenumber, σ, ν ˜