Open AccessThe coincidence method for the wave-length measurement of absorption bands
Author(s) -
H. Hartridge
Publication year - 1923
Publication title -
proceedings of the royal society of london. series b, containing papers of a biological character
Language(s) - English
Resource type - Journals
eISSN - 2053-9185
pISSN - 0950-1193
DOI - 10.1098/rspb.1923.0007
Subject(s) - coincidence , absorption (acoustics) , spectrometer , optics , absorption spectroscopy , physics , materials science , analytical chemistry (journal) , chemistry , medicine , alternative medicine , pathology , chromatography
(1) Measurements of the absorption bands of pigments by means of the ordinary spectroscope are found to be inaccurate, because of the breadth of the bands and the indefiniteness of their margins. (2) The adjustment of two similar absorption bands into coincidence is found to be effected with considerable accuracy. If then a spectroscope is designed in which two spectra are seen side by side, on looking down the eye piece, but reversed in direction with one another, the measurement of the mean wave-length of the absorption bands can be accurately carried out.