Picosecond Transient Absorption of Xanthene Dyes |
| O. Berndt, F. Bandt, I. Eichwurzel and H. Stiel Max-Born-Institut für Nichlineare Optik und Kurzzeitspektroskopie, Rudower Chaussee 6, 12489 Berlin, Germany |
| Received: July 23, 1998; in final form December 28, 1998 |
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| After one- and two-colour ps-excitation the transient absorption of rose bengal, erythrosin B and eosin Y in the spectral range from 450 to 670 nm was probed using picosecond continuum pulses generated in H2O-D2O mixture. Our experiments showed for all dyes a high T1-Tn absorption signal above 590 nm where no ground state absorption occurs. These excited triplet states can be effectively populated by a delayed second pump pulse. Their properties with special attention to reverse intersystem crossing processes from Tn to Sx are discussed. |
| DOI: 10.12693/APhysPolA.95.207 PACS numbers: 31.50.+w, 33.50.-j, 78.47.+p |