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DTSTART:20120913T113000
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URL:https://murmitoyen.com/events/vanille/udem/detail/69859
LOCATION:Université de Montréal - Pavillon Roger-Gaudry\, 2900\, chemin d
 e la Tour\, Montréal\, QC\, Canada\, H3T 1J6
SUMMARY:Conférence Barré 2 avec le professeur Richard Van Duyne
DESCRIPTION:Titre de la conférence no 2New Directions in Molecular Plasmon
 ics: Pushing the Sensitivity\, Space\, and Time LimitsLe Département de 
 chimie a le plaisir et l’honneur d’accueillir le professeur Richard Va
 n Duyne\, du Département de chimie de la Northwestern University\, dans 
 le cadre des conférences Barré. Il donnera deux conférences différent
 es en anglais les 12 et 13 septembre 2012.Résumé de la conférence no 
 2In 1997\, the startling observation of single molecule surface enhanced R
 aman spectroscopy (SMSERS) was first reported. Over time the\, the eviden
 ce for the existence of SMSERS as well as the magnitude of the enhancemen
 t factor was called into question. In the first part of this lecture\, I 
 will discuss our efforts to provide a robust existence proof for SMSERS e
 mploying a frequency-domain approach with two isotopologues of Rhodamine 6
 G (R6G) that provide unique vibrational signatures. When an average of on
 e molecule is adsorbed per Ag nanoparticle\, only one isotopologue is obs
 erved in a dry N2 environment. Isotopologues were subsequently used to st
 udy the structure of SMSERS active nanoparticle assemblies by HRTEM\, per
 form single molecule excitation spectroscopy measurements\, and analyze t
 he SMSERS of crystal violet (CV). This section will conclude with a proof-
 ofconcept demonstration single molecule LSPR spectroscopy. The concludin
 g section of this lecture will focus on three very recent developments: (
 1) single molecule tip-enhanced Raman spectroscopy (SMTERS)\; (2) ultrahig
 h vacuum tipenhanced Raman spectroscopy (UHV-TERS)\; and (3) surface-enha
 nced femtosecond stimulated Raman spectroscopy (SE-FSRS). The isotopologu
 e proof of single molecule specificity in ambient TERS will be demonstrat
 ed. A UHV-TERS instrument has been constructed with atomic resolution of 
 the surface and sub-molecular resolution of the adsorbate. The capabiliti
 es of this machine are shown with the copper phthalocyanine (CuPc)/Ag(111
 ) system. For the first time\, the revolutionary techniques of surface enh
 anced Raman spectroscopy and femtosecond stimulated Raman spectroscopy (F
 SRS) have been combined. Thus\, plasmonically enhanced broadband Raman sp
 ectra using an ultrafast four wave mixing process\, which can simultaneou
 sly achieve spectral and temporal resolution below the time-energy uncert
 ainty limit\, has been achieved! We can now forsee the day when it will b
 e possible to combine UHV-TERS and surface enhanced FSRS to enable single
 -molecule spectroscopy with simultaneous nanometer spatial resolution and
  femtosecond time resolution.À propos des conférences BarréAncrées da
 ns une longue tradition qui date de 1979\, les conférences Barré rendent
  hommage à la générosité du regretté professeur Roger Barré\, qui a 
 enseigné la chimie à l’Université de Montréal tout au long de sa car
 rière. En l’honneur de son père\, il a créé par testament la Fondati
 on Henri-Barré\, dont les revenus permettent au Département de chimie d
 ’inviter des scientifiques de renom à présenter une série de deux con
 férences devant la communauté de chimie montréalaise.Profil et intérê
 ts de recherche
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