Die Lichtabsorption von Tetraalkyl‐ammoniumsalzen

Energy migration and fluorescence

“…In 1889, Walter 41 already explained quenching by formation of nonfluorescent associates, which enabled him to interpret, apart from concentration dependence, the decrease in quenching upon temperature increase as a decrease in association. He found a confirmation of the assumed association in deviations in the absorption coefficient from Beer's law, which were later confirmed by different authors 20,31,37 using a range of fluorescent dyes. In the short-wavelength range of their absorption spectra there appears, in addition to the low concentration band, a second band which can only be assigned to association.…”

“…From this consideration it can also be concluded that the oscillation with a phase difference of 180°is slower, because the electrostatic interaction of the oscillating charges opposes For a justification, see for example KORTUM. 20 the restoring force. The energy level corresponding to the forbidden transition is thus lower.…”