Nonradiative decay of excited molecules near a metal surface

✍ Scribed by I. Pockrand; A. Brillante; D. Möbius

• Publisher: Elsevier Science
• Year: 1980
• Tongue: English
• Weight: 577 KB
• Volume: 69
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(80)85113-x

✦ Synopsis

Nonradlatwe energy transfer from evated dye molecules near a metal surface to plasmon surface polaritons has been mvrstlgated expenmentally. By usmg the Langmwr-Blodgett techmque, the molecule-metal separation was varied and the cohplmg eftklency measured with the mverse attenuated-total-reflection technique. For an orient&on of the trz& tlon dipole moment of the dye parallel to a silver surface. and nonresonant interaction, maximum energy transfer to pIasmon surface polantons was observed for a molecule-silver spacing of about 18 nm. Reducing the spacing results in a monotome decrease of the couphng efficiency: this decay channel becomes unimportant and eventuaBy vanishes if the molecule is placed very close to the metal surface. The experimental results are discussed in connection with theoretical predlctlons and the surface-enhanced

Raman scattenng observed for some adsorbates at metal surfaces.