# TIME-RESOLVED SPECTROSCOPY OF EUROPIUM $CHELATES^{\ast}$

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/14653

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 Title: TIME-RESOLVED SPECTROSCOPY OF EUROPIUM $CHELATES^{\ast}$ Creators: Bhaumik, M. L.; Nugent, L. J. Issue Date: 1964 Abstract: Time-resolved fluorescence spectra of europium chelates have been recorded using the stroboscopic time resolution technique. These spectra show that the main emitting level $^{5}D_{0}$ of the europium ion is populated via the higher level $^{5}D_{1}$. The relaxation time of the level $^{5}D_{1}$ is measured to be of the order of $1-2 \mu s$. The data indicate that the mechanism of relaxation in chelates is similar to that responsible for non-radiative quenching in these compounds. The time-resolved spectra may also give further support to Crosby's theory of energy transfer via the triplet state in chelates. URI: http://hdl.handle.net/1811/14653 Other Identifiers: 1964-P-07