An absolute light scattering photometer: II. Direct determination of scattered light from solutions

Abstract

The liO"ht scattering photometer r ecently described in this journal by McIntyre a nd Doderer ha~ bee n examined to determ ine its abili ty to m eas ure t he absolute sCl),ttel"ln g. of liq uids. The absolute scat te rin~ of polymer so lu t i ons~vas deter~llled .frmn transrr~l ss l on m eas urements a nd from two d lfI ere nt tra nsverse m easur em ents. lhe ex pell mental results are in good agree me nt. The va ri ables of t he photometric system were a lso .~nal yzed a nd experimentally studi ed to determine Its ab ili ty to meas ure a bsolute scattelln g of li quids under differ ent gco metri cal arra ngements.

Light scattering from cylindrical cells in the `Sofica' photometer

“…For cylindrical cells, the correction factor has the form (nz/nk)m where nl and n k are the refractive indices (n) of the solution or liquid (I) under study to that of the calibrating medium (k). Whereas a unity value of m was earlier proposed from theoretical considerations (Brice et al 1950, Carr and Zimm 1950, Doty and Edsall 1951 it has become more general to use m = 2 (Hermans and Levinson 1951, Deielic and Vavra 1966, Wippler and Scheibling 1954, McIntyre 1960, Billmeyer et al 1970. Hermans and Levinson were careful to stress that this is only valid when the detector does not see vertically past the horizontal edges of the incident beam as it traverses the cell.…”