Molar absoptivities may be very large for strongly absorbing chromophores >10,000)and very small if absorption is weak(10 to 100). The magnitude of e reflects both the size of the chromophore and the probability that light of a given wavelength will be absorbed when it strikes the chromophore a general equation stating this relationship may be written as follows e=0.87*1020R*a (R is the transition probability(o to 1)& a is the chromophore area in cm 兀- orbita C o2 n-orbitals 元*- orbita electronMolar absoptivitiesmay be very large for strongly absorbing chromophores (>10,000) and very small if absorption is weak (10 to 100). The magnitude of e reflects both the size of the chromophore and the probability that light of a given wavelength will be absorbed when it strikes the chromophore. A general equation stating this relationship may be written as follows: e = 0.87*1020 R * a (R is the transition probability (0 to 1) & a is the chromophore area in cm2 )