title: Nanoparticle-free single molecule anti-stokes Raman spectroscopy.
abstract: In the absence of large, plasmon-supporting nanoparticles, biocompatible dendrimer- and peptide-encapsulated few-atom Ag nanoclusters produce scaffold-specific single molecule (SM) Stokes and anti-Stokes Raman scattering. The strong SM vibrational signatures are enhanced by the Agn transitions in nanoparticle-free samples and cannot arise from plasmon enhancement. Characteristic SM-Raman intermittency is observed, with antibunching of the underlying Agn emission directly confirming the SM nature of the emissive species.
authors.affiliation: School of Chemistry and Biochemistry, Georgia Institute of Technology Atlanta, Georgia 30332-0400, USA.
authors.forename: Lynn
authors.initials: L
authors.lastname: Peyser-Capadona
authors.forename: Lynn Peyser
authors.initials: LP
authors.lastname: Capadona
authors.forename: Jie
authors.initials: J
authors.lastname: Zheng
authors.forename: Jose I
authors.initials: JI
authors.lastname: González
authors.forename: Tae-Hee
authors.initials: TH
authors.lastname: Lee
authors.forename: Sandeep A
authors.initials: SA
authors.lastname: Patel
authors.forename: Robert M
authors.initials: RM
authors.lastname: Dickson
mesh_terms: D020099:Coated Materials, Biocompatible / Q000032:analysis* / Q000737:chemistry*; D050091:Dendrimers; D049329:Nanostructures / Q000032:analysis / Q000737:chemistry*; D010455:Peptides / Q000032:analysis / Q000737:chemistry*; D011073:Polyamines / Q000032:analysis / Q000737:chemistry*; D012834:Silver / Q000032:analysis / Q000737:chemistry*; D013059:Spectrum Analysis, Raman / Q000379:methods*
chemical_list: D020099:Coated Materials, Biocompatible; D050091:Dendrimers; C104700:PAMAM Starburst; D010455:Peptides; D011073:Polyamines; D012834:Silver