โ Scribed by H.O. Albrecht; W.C. Denison; L.G. Livingston; C.E. Mandeville
No coin nor oath required. For personal study only.
The weak light-emission of Chlorella pyrenoidosa about 4 seconds after illumination by photosynthesizing blue light shows an apparent partial quenching when radiation at X7000 A is simultaneously applied. This result accords with the present view that this afterglow arises from the thermal release of electrons trapped in a crystalline structure of chlorophyll. The "quenching" radiation would provide optical release. Phosphorescence excited by longer wavelengths than blue is not quenched, suggesting it to arise by an essentially different mechanism. Chlorophylls and derivatives dissolved in a fihn of cellulose butyrate show a rather characteristic weak afterglow, often of several minutes half-life, of shorter wave-length than the fluorescence, and which is not certainly a light-induced oxidative chemiluminescence.
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