Abstract
The fluorescence, Raman, and fluorescence excitation spectra of diphenyloctatetraene and diphenylhexatriene condensed on rough silver are reported. The fluorescence excitation spectra reveal that on silver the normally dipole-forbidden 1Ag←X 1Ag absorption takes place in addition to the allowed 1Bu←X 1Ag process. This is attributed to the large electric field gradient which is present near an illuminated metal surface causing the intensity of quadrupole absorptions to become unusually great. The possible contribution of this field gradient to two-photon processes in centrosymmetric molecules and to the intensity of bands in infrared and EELS spectra is also noted. In addition, the relative fluorescence intensities of these molecules adsorbed on rough and smooth silver are discussed in terms of the effectiveness of nonradiative decay into metal channels.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
