molar absorption coefficient


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Related to molar absorption coefficient: Molar extinction coefficient, Beer lambert law

mo·lar ab·sorp·tion co·ef·fi·cient (ε),

absorbance (of light) per unit path length (usually the centimeter) and per unit of concentration (in moles per liter); a fundamental unit in spectrophotometry.

mo·lar ab·sorp·tion co·ef·fic·ient

(ε) (mō'lăr ab-sōrp'shŭn kō-ĕ-fish'ĕnt)
Absorbance (of light) per unit path length (usually the centimeter) and per unit of concentration (moles per liter); a fundamental unit in spectrophotometry.
Synonym(s): absorbancy index (2) , absorptivity (2) .
References in periodicals archive ?
code ([DELTA]v) ([epsilon](v) x [cm.sup.-1] [10.sup.4]) [M.sup.-1] [cm.sup.-1] FxM1 glass, x = 1-4 Peak I F1M1 1608.67 8.0034 F2M1 1676.87 8.0034 F3M1 1599.03 8.0034 F4M1 2872.89 8.0026 M1 11377.46 8.0000 Peak II F1M1 1351.54 0.2351 F2M1 1336.21 0.2351 F3M1 1351.46 0.2351 F4M1 1369.46 0.2328 M1 7030.67 0.2324 FxM4 glass, x = 1-4 Peak I F1M4 3238.52 3.8219 F2M4 4210.91 3.8219 F3M4 3921.74 3.8219 F4M4 2661.22 3.8210 M4 46257.75 3.8200 Peak II F1M4 1269.53 0.0035 F2M4 1761.06 0.0035 F3M4 2430.14 0.0035 F4M4 923.38 0.0012 M4 4838.51 0.0008 (a) Peak absorption wavelength ([[lambda].sub.abs]); (b) oscillator strength (f) of absorption bands; (c) FWHM ([DELTA]e) ofbands; and (d) molar absorption coefficient [[epsilon](v)] of MG in Fe-MG doped Si[O.sub.2] sol-gel glasses.
The molar absorption coefficient of BCTE-HABI at 365 nm ([epsilon] = 2300 [mol.sup.-1] 1 [cm.sup.-1]) is much higher than that of o-Cl-HABI ([epsilon] = 572 [mol.sup.-1] 1 [cm.sup.-1]).
Some terms have multiple abbreviations, e.g., "molar absorption coefficient" is introduced as both K and [member of].
Because chromophore ionization increases with temperature and decreases by addition of salts and proteins, the molar absorption coefficient at 37[degrees]C was ~8% higher than at 30[degrees]C, so that [[epsilon].sub.405] ([m.sup.2/mol) was calculated to 1200.5 [+ or -] 14 (mean [+ or -] SD; n = 8) for protein-free samples and to 1120 [+ or -] 15 for sera (with 67 g/L protein) under the conditions of the assay.