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Surface-enhanced Raman excitation spectroscopy of a single rhodamine 6G molecule.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Dieringer, Jon Albert Wustholz, Kristin L. Masiello, David J. Camden, Jon P. Kleinman, Samuel L. Schatz, George C. Duyne, Richard P. Van |
| Copyright Year | 2009 |
| Abstract | The surface-enhanced Raman excitation profiles (REPs) of rhodamine 6G (R6G) on Ag surfaces are studied using a tunable optical parametric oscillator excitation source and versatile detection scheme. These experiments afford the ability to finely tune the excitation wavelength near the molecular resonance of R6G (i.e., approximately 500-575 nm) and perform wavelength-scanned surface-enhanced Raman excitation measurements of a single molecule. The ensemble-averaged surface-enhanced REPs are measured for collections of molecules on Ag island films. The relative contributions of the 0-0 and 0-1 vibronic transitions to the surface-enhanced REPs vary with vibrational frequency. These results highlight the role of excitation energy in determining the resonance Raman intensities for R6G on surface-enhancing nanostructures. Single-molecule measurements are obtained from individual molecules of R6G on Ag colloidal aggregates, where single-molecule junctions are located using the isotope-edited approach. Overall, single-molecule surface-enhanced REPs are narrow in comparison to the ensemble-averaged excitation profiles due to a reduction in inhomogeneous broadening. This work describes the first Raman excitation spectroscopy studies of a single molecule, revealing new information previously obscured by the ensemble. |
| File Format | PDF HTM / HTML |
| DOI | 10.1021/ja8080154 |
| Alternate Webpage(s) | http://sites.northwestern.edu/vanduyne/files/2012/10/2009_Dieringer.pdf |
| Alternate Webpage(s) | http://www.dstuns.iitm.ac.in/grouppresentations/2009/Surface-Enhanced%20Raman%20Excitation%20Spectroscopy%20of%20a%20Single%20Rhodamine-6G%20Molecule.pdf |
| PubMed reference number | 19140802 |
| Alternate Webpage(s) | https://doi.org/10.1021/ja8080154 |
| Journal | Medline |
| Volume Number | 131 |
| Issue Number | 2 |
| Journal | Journal of the American Chemical Society |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
