Rhodamines laser spectroscopy

The rotational reorientation times of the sample in several solvents at room temperature were measured by picosecond time-resolved fluorescence and absorption depolarization spectroscopy. Details of our experimental setups were described elsewhere. For the time-correlated single photon counting measurement of which the response time is a ut 40 ps, the sample solution was excited with a second harmonics of a femtosecond Ti sapphire laser (370 nm) and the fluorescence polarized parallel and perpendicular to the direction of the excitation pulse polarization as well as the magic angle one were monitored. The second harmonics of the rhodamine-640 dye laser (313 nm 10 ps FWHM) was used to raesisure the polarized transient absorption spectra. The synthesis of the sample is given elsewhere. All the solvents of spectro-grade were used without further purification. 

The spectroscopy and laser action of rhodamine 6G in doped aluminosilicate glass (xerogels) shows that dyes can be very stable under these conditions . 

Rhodamine B H3C. A common fluoix hore and laser dye, used in A bs 460-600 nm — 0.65 in fluorescence correlation spectroscopy and basic ethanol, 0.49 in ethanol. is ELISA. Often used as a tracer dye to tenqrecature dependent (119, 20]. determine the rate and direction of flow and transport. A concentrated solution in glycerol is used as a quantum counter out to 600 nm. 

Mckieman J.M., Yamanaka S.A., Dunn B. Zink spectroscopy and laser action of Rhodamine 6G doped aluminosilicate xerogels. J. Phys. Chem. 1990 5652-5654 Merohtra R.C. Present status and fntnre potential of the sol-gel process. In Chemistry Spectroscopy and Applications of Sol-Gel Glasses, Reisfeld R., Jorgensen C.K., eds.. Struct. Bond. 1992 77 1-36... 

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