Photomagnetism. Determination of the Paramagnetic Susceptibility of a Dye in Its Phosphorescent State
- 1 September 1949
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 17 (9) , 804-812
- https://doi.org/10.1063/1.1747403
Abstract
The molar paramagnetic susceptibility of acid fluorescein dye in its 2‐sec. phosphorescent state in boric acid glass at 25°C has been measured directly by means of a modified Theorell microbalance. The steady state concentration of phosphorescent state molecules was 1.96×10−8 mole per cm length of sample, calculated from optical intensity integrals and phosphorescence saturation curve data. The measured boom displacement was 4.04×10−3 cm, corresponding to a force of 1.07×10−2 dyne. The calculated value of the molar paramagnetic susceptibility is 3090×10−6 c.g.s. units, which agrees with the measured value for the susceptibility of the 3Σ ground state of oxygen within the estimated maximum experimental error of 13 percent.Keywords
This publication has 7 references indexed in Scilit:
- Fabrication of Boric Acid Glass for Luminescence Studies*Journal of the Optical Society of America, 1948
- Phosphorescence and the R⊚le of the Triplet State in the Electronic Excitation of Complex Molecules.Chemical Reviews, 1947
- PARAMAGNETISM OF THE PHOSPHORESCENT STATEJournal of the American Chemical Society, 1945
- Phosphorescence in Fluid Media and the Reverse Process of Singlet-Triplet AbsorptionJournal of the American Chemical Society, 1945
- Phosphorescence and the Triplet StateJournal of the American Chemical Society, 1944
- Reversible Photochemical Processes in Rigid Media. A Study of the Phosphorescent StateJournal of the American Chemical Society, 1941
- A Study of the Relation of the Intensity of Fluorescence to the Concentration in the Case of Solid SolutionsJournal of the Optical Society of America, 1931