Accession Number : AD0713177

Title :   NANOSECOND TIME-RESOLVED EMISSION SPECTROSCOPY: SPECTRAL SHIFTS DUE TO SOLVENT-EXCITED SOLUTE RELAXATION.

Descriptive Note : Technical rept.,

Corporate Author : MINNESOTA UNIV MINNEAPOLIS DEPT OF CHEMISTRY

Personal Author(s) : Ware,William R. ; Lee,Sai K. ; Brant,Gary J. ; Chow,Peter P.

Report Date : 28 SEP 1970

Pagination or Media Count : 37

Abstract : Nanosecond time-resolved emission spectral techniques have been applied to the problem of the origin and nature of the well-known temperature-dependent spectral shifts characteristic of the aminophthalimides in alcohol solvents. It is demonstrated that the temperature-dependent spectral shifts are in fact due to time-dependent spectral shifts. At least two relaxation times characterize this phenomenon. One relaxation time is observed to be subnanosecond in character and may be associated with the exciplex that presumably is present in the system. The other relaxation time is presumably associated with the non-specific dipolar reorientation although it has distinctly different characteristics from the solvent dielectric relaxation time. Wavelength-dependent fluorescence decay that can be explained by the time dependence of the emission spectrum is also observed. (Author)

Descriptors :   (*IMIDES, *FLUORESCENCE), SOLUTIONS(MIXTURES), PROPANOLS, PHTHALIC ACIDS, ELECTRON TRANSITIONS, MOLECULAR ORBITALS, RELAXATION TIME, EXCITATION

Subject Categories : Organic Chemistry
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE