Optical Spectroscopy and Instrumentation (Chapter 7) (IR,visible and UV) pathlength b concentration c Transmittance T=I 10 Percent Transmittance %T= 1×100% Io Absorbance A=-logT =-o80 I 二1og1 Examples: T=1.00(100%T),A=0.00 T=0.10(10%T),A=1.00 T=0.001(0.1%T),A=3.00 CEM 333 page 3.1 Optical Spectroscopy and Instrumentation (Chapter 7) (IR, visible and UV) I0 I pathlength b concentration c Transmittance T = I I0 Percent Transmittance %T = I I0 ´100% Absorbance A = -logT = -log I I 0 = log I0 I Examples: T=1.00 (100 %T), A=0.00 T=0.10 (10 %T), A=1.00 T=0.001 (0.1 %T), A=3.00 CEM 333 page 3.1