R J Robbins

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Picosecond time dependent fluorescence depolarization has been used to study the rotational diffusion of 2,5-bis (5'-t-butyl-2-benzoxazolyi) thiophene (BBOT) in cyclohexane and ethanol. The measured rotational correlation times were: 180 i 30 ps (cyclohexane) and 210 * 30 ps (ethanol)_ These results are in agreement with those predicted from hydrody-namics(More)
  • S Luk, R J Hoover, A H Maki, D Waugh, H F Walton, J A Laswick +26 others
  • 2001
Picosecond time-resolved fluorescence studies of 8-anilino-1-naphthalenesulfonic acid (A N S) have been carried out in a water-ethanol mixed-solvent system. Combined with quantum yield results, these data provide further insight into the nonradiative processes that can take place in this interesting fluorescence probe molecule. In a mixed solvent, the(More)
Streak camera detection has been used to determine the temporal characteristics of pulses from Nd:phosphate glass used as a mode-locked laser oscillator and as an amplifier. The frequency doubled pulses are not transform limited (za~, = 46 cm-t , At = 6 ps). The fourth harmonic has a spectral bandwidth of 11 cm-J and is tunable across the full bandwidth of(More)
Stimulated emission from organic dyes provides us with the potential for producing tunable, short pulsed lasers. Stimulated emission can also interfere in the measurement of excited state lifetimes of dyes when excited by intense picosecond pulses. Tie-resolved measurements of the emission from several organic dyes as a function of excitation intensity have(More)
Pïcosecond time dependent fluorescente depolarization has been used to measure the rotational diff=sion time of 3,3'iliethyloxadicarjocyanine iodide (DODCI) in solution at 293 K: the stable form of DODCI was shown to have a " coiled " form, the cis,&-1 ,%conformation, whereas the photoisomer formed bu tiradiating DODCI in solution was shown to be tbe(More)
&I experimental system for the study of subnanosecond fluorescence spectroscopy is described and some general classes of experiments in this research area are proposed. A special emphasis is placed on nonexponential decays, and competition between radiative and nonradiative processes in this temporal domain is described. A new type of diffusion controlled(More)
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