Title :
Time-resolved vibrational spectroscopy of the degenerate excited singlet states of diphenylhexatriene
Author :
Werncke, W. ; Hogiu, S. ; Pfeiffer, Michael ; Lau, Antonio
Author_Institution :
Max-Born-Inst. fur Nichtlinear Opt. & Kurzzeitspektroskopie, Berlin, Germany
Abstract :
Summary form only given.In DPH the relaxation of the initially formed 1/sup 1/B/sub u/ state to a 1/sup 1/B/sub u//2/sup 1/A/sub g/ equilibrium mixture as well as the kinetics of the transients investigated by picosecond time-resolved absorption and fluorescence spectroscopy is still the subject of controversy. We applied picosecond time-resolved resonance coherent antiStokes Raman (CARS) spectroscopy for: (i) characterization of the origin of the transient absorption by the signature of vibrational spectra, (ii) information about the molecular structures of excited electronic states as well as their kinetics, (iii) measurements of the excited state electronic third-order hyperpolarizabilities.
Keywords :
coherent antiStokes Raman scattering; excited states; nonlinear optical susceptibility; organic compounds; photoexcitation; polarisability; time resolved spectra; degenerate excited singlet states; diphenylhexatriene; electronic third-order hyperpolarizabilities; excited electronic states; fast energy exchange; molecular structures; photoexcitation; time-resolved resonance CARS; time-resolved vibrational spectroscopy; transient absorption; Absorption; Kinetic theory; Laser excitation; Polarization; Raman scattering; Resonance; Shape; Spectroscopy; Stationary state; Vibration measurement;
Conference_Titel :
Quantum Electronics Conference, 1998. IQEC 98. Technical Digest. Summaries of papers presented at the International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
1-55752-541-2
DOI :
10.1109/IQEC.1998.680203
