Helmholtz's treatise on physiological optics
1924; Elsevier BV; Volume: 198; Issue: 6 Linguagem: Inglês
10.1016/s0016-0032(24)90484-4
ISSN1879-2693
AutoresHermann L. F. Helmholtz, James P. C. Southall, Allvar Gullstrand, Johannes von Kries, Wolfgang E. Nagel,
Tópico(s)Optical Imaging and Spectroscopy Techniques
ResumoThe photochemical law governing chemical conversion of a photoactive species is derived and solved analytically. In the absence of solution mixing, the law predicts a remarkable symmetry in which the dependence of light intensity on distance matches the dependence of concentration on time. An exact method is described whereby a time sequence of experimental transmittance/absorbance data obtained during a light-induced chemical process can provide a value of the quantum yield for the photoreaction. It is demonstrated that this procedure is not invalidated by solution mixing.
Referência(s)