Solvent reorganization around a "giant dipole" molecule Academic Article

abstract

• The fluorescence risetimes of the1Laand1Lbexcited states of p -dimethylaminobenzonitrile (DMAB) in ethanol and methylcyclohexane following irradiation at room temperature by the fourth harmonic (2650 A) of a Nd3 +glass laser were measured directly using picosecond spectroscopy. The onset of!Lbfluorescence, governed by prior vibronic relaxation in both polar and nonpolar solvents, occurs within 7-20 psec after the exciting pulse. The1Lafluorescence, characterized by a noticeably longer risetime of 40 psec at room temperature, yields directly the solvent orientational relaxation time in the field of the ' state's large dipole moment (23 D). This measured relaxation time is consistent with a modification of the Debye theory of viscosity-limited solvent reorganization.

authors

• Rentzepis, Peter

published proceedings

• The Journal of Chemical Physics

author list (cited authors)

• Struve, W. S., Rentzepis, P. M., & Jortner, J.

complete list of authors

• Struve, WS||Rentzepis, PM||Jortner, J

publication date

• December 1973

published in

• Journal of Chemical Physics  Journal

start page

• 5020

end page

• 5041

volume

• 59

issue

• 9