By Ian M. Mills, International Union of Pure and Applied Chemistry. Commission on Physicochemical Symbols, Terminology, and Units
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Extra resources for Quantities, Units, and Symbols in Physical Chemistry, 2nd Edition
Sample text
34 The situation is further complicated by the fact that some authors use the symbol S for any of the above quantities, particularly for any of the quantities here denoted A, S and S. It is therefore particularly important to define quantities and symbols used in reporting integrated intensities. For transitions between individual states any of the more fundamental quantities B, or I I may be used; the relations are as given above, and are exact. Note, however, that the integrated absorption coefficient A should not be confused with the Einstein coefficient (nor with absorbance, for which the symbol A is also used).
18) The definitions given here relate the absorbance A10 or A to the internal absorptance o; see note (16). However the subscript i on the absorptance is often omitted. (19) In reference [19] the symbol A is used for decadic absorbance, and B for napierian absorbance. (20) 1 is the absorbing path length, and c is the amount (of substance) concentration. (21) The molar decadic absorption coefficient e is frequently called the 'extinction coefficient' in published literature. Unfortunately numerical values of the 'extinction coefficient' are often quoted without specifying units; the absence of units usually means that the units are mol' dm3 cm '.
B1 rather than By). ) . . 'p(vJ)BJNJ 5 1—1 ig I CIi, P W 3 I I = d'P/dQ Wsr 3 M M dcP/dAsource W m2 3 s kg d2cP U ,Ulisource L L= intensity, irradiance (radiant flux received) spectral intensity, spectral irradiance I, E I = thli/dA fluence F, (H) F = $1 dt = emittance Stefan—Boltzmann constant êtendue (throughput, light gathering power) resolving power resolution free spectral range C c = M/Mbb quality factor 4, 5 dN/dt = — = dQ/dt radiance finesse Notes W sr' m 2 3 6 Wm2 37 A I(v), E(i) I(v) = dI/di dt Wm 1 8 Jm2 9 1 10 Wm2 K4 10 E, (e) Mbb = cjT4 E = AQ = li/L m2 sr 11 R R= f = 1/21 f= Av7v m m 1 12 2, 12, 13 2, 14 14 Q Q = 2tv 1 14, 15 a 1 — w dW/dt (6) The radiance is a normalized measure of the brightness of a source; it is the power emitted per area of source.