title: Lévy statistics of vibrational mode fluctuations of single molecules from surface-enhanced Raman scattering.
abstract: Surface-enhanced Raman spectra of a single Fe-protoporphyrin IX molecule display drastic fluctuations in frequency and intensity. When analyzed in their temporal evolution, the vibrational modes of the molecule undergo an on-off switching behavior that is shown to follow a Lévy statistics. Such a time dependent process may encode both the dynamics of the molecule-environment interactions and the intrinsic gating or activation of the mode emission mechanism.
authors.affiliation: Biophysics and Nanoscience Centre, Dipartimento di Scienze Ambientali, Universitá della Tuscia, 1-01100 Viterbo, Italy.
authors.forename: Anna Rita
authors.initials: AR
authors.lastname: Bizzarri
authors.forename: Salvatore
authors.initials: S
authors.lastname: Cannistraro
mesh_terms: D003102:Colloids / Q000737:chemistry; D058085:Iron Compounds / Q000737:chemistry*; D008665:Metalloporphyrins / Q000737:chemistry*; D011524:Protoporphyrins / Q000737:chemistry*; D013059:Spectrum Analysis, Raman / Q000379:methods*; D013499:Surface Properties
chemical_list: D003102:Colloids; D058085:Iron Compounds; D008665:Metalloporphyrins; D011524:Protoporphyrins; C028025:protoporphyrin IX