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Friday, June 18

All times in Eastern Daylight Time (GMT-4)

Chair: Lev Chuntonov, Technion, Israel

9:00 - 9:30 am | Junrong Zheng, Peking University, China

What Leads to Aggregation-Induced Emission?

The mechanism of aggregation-induced emission (AIE) of tetraphenylethylene (TPE) type molecules is elucidated with both experimental and theoretical efforts, which also leads to the discovery of anti-Vavilov’s rule for single electronic excited state.

9:30 - 10:00 am | Nien-Hui Ge, University of California Irvine, USA

Hyperspectral Imaging with Vibrationally Resonant Sum-Frequency Generation Microscopy

To enable fast acquisition of vibrational spectra and images of chemical, biological, and material systems, we have developing a new vibrationally resonant sum-frequency generation microscope coupled with high-repetition-rate femtosecond pulses. The microscope is capable of multiplex detection and phase-resolved measurements using self-phase-stabilized spectral interferometry. Applications to biological systems will be discussed.

10:00 - 10:20 am | Deborin Ghosh, CSIR-National Chemical Laboratory, India

Picosecond dynamics probes the surface-ligand interactions of quantum dots: Insights from 2D IR spectroscopy

In this work, 2D IR spectroscopy has been used to characterize the diversity in surface-ligand interactions in thiocyanate-capped CdS quantum dots. Our results show that SCN- stabilizes the QD by neutralizing the surface charges through covalent binding as well as through electrostatic stabilization.

10:20 - 10:35 am | Break

10:35 - 11:05 am | Erik Nibbering, Max Born Institute, Germany

Switching between Proton Vacancy and Excess Proton Transfer Pathways

With ultrafast infrared spectroscopy we explore distinct proton transport pathways between the proton donating and accepting sites of the bifunctional photoacid 7-hydroxyquinoline in protic solvents. Our results indicate how one can switch between proton vacancy (“proton hole”) and excess proton mechanisms as dominant proton transport pathway.

11:05 - 11:35 am | Tönu Pullerits, Lund University, Sweden

Hot Electron Cooling in Perovskite Nanostructures and the Role of Vibrations

Hot carrier solar cell is an attractive concept for improving photovoltaic power conversion efficiency. We analyze hot electron relaxation in perovskite nanostructures and discuss it in the context of hot carrier photovoltaics. We will also present very recent results on CO2 reduction to CO in a Re complex COF system.

11:35 - 11:55 am | Poul Petersen, Rühr-University Bochum, Germany

Full-Spectrum 2D IR Spectroscopy

The spectral coverage of 2D IR spectroscopy is typically limited to only a few percent of the potential mid-IR 2D spectrum. Here we present full-spectrum 2D IR spectroscopy utilizing mid-IR continuum pulses as both excitation and detection pulses capturing close to the full mid-IR 2D spectrum.

11:55 - 12:10 pm | Break

During the break we will take a group photo in the Ann Arbor room of the Gather site. Please assemble there so we can document all the TRVS avatars!

Chair: Sean Garrett-Roe, University of Pittsburgh

12:10 - 12:40 pm | Peter Vöhringer, University of Bonn, Germany

Carbon-dioxide binding to transition metals. Insights from ultrafast time-resolved infrared spectroscopy

Coordination compounds bearing oxalato ligands are intriguing photochemical precursors for transition metal (TM) carbon dioxide complexes. Here, we report on the photoinduced ultrafast dynamics of these precursors and derive unique information about the molecular and electronic structures of the TM-CO2 products from femtosecond infrared (IR) spectroscopy.

12:40 - 1:10 pm | Tullio Scopigno, University of Rome, Italy

Excited state Impulsive Stimulated Raman Spectroscopy

Aiming at assigning vibrational spectroscopic signals arising from different electronic states and at identifying the vibronic couplings ruling ultrafast processes, I will discuss novel control knobs and multidimensional capabilities for mapping excited state surfaces by Impulsive Stimulated Raman Spectroscopy.

1:10 - 1:30 pm | James Shipp, University of Sheffield, UK

New insights into the vibrational dynamics of Pt(II) donor-bridge-acceptor complexes with ultrafast 2DIR spectroscopy

The vibrational dynamics of four Pt(II) D-B-A complexes have been studied by 2DIR spectroscopy to understand how vibrational energy propagates from the bridge to the ligands by population transfer, coherence transfer, and IVR. 13C substitution in the bridge resulted in large changes to the vibrational dynamics and coupling interactions.

1:30 - 1:45 pm | Break

1:45 - 2:15 pm | Henrike Muller-Werkmeister, University of Potsdam, Germany

Site-specific vibrational probes beyond non-canonical amino acids: 2D-IR of carbohydrates

Site-specific probes have enabled detailed biophysical investigations with 2D-IR. In this talk I’ll introduce how we expand the concept of site-specific vibrational reporter groups to another important class of biological macromolecules, as we investigate labelled monosaccharides towards applications in biomolecular recognition.

2:15 - 2:35 pm | Andrea Lapini, University of Parma, Italy

Modification of local and collective dynamics of water in perchlorate solution, induced by pressure and concentration

The aim of the present work is the experimental investigation of the interplay between the local structural modifications induced by the perchlorate ions and the collective dynamical properties of the solvent. Ultrafast Optical Kerr Effect (OKE) and time resolved infrared absorption are the experimental techniques adopted.

2:35 - 2:50 pm | Break

Chair: Kevin Kubarych, University of Michigan

2:50 - 3:20 pm | Amber Krummel, Colorado State University, USA

TBA

abstract

3:20 - 3:50 pm | Edwin Heilweil, National Institute of Standards and Technology, USA

Time-Resolved Infrared Spectroscopy of CN-substituted [FeFe]-Hydrogenase Model Species

The vibrational dynamics of two model Fe-Fe Hydrogenase compounds containing single cyano functional groups were investigated using UV-visible excitation with Time-Resolved IR Spectroscopy and Density Functional Theory. Rapid decay and formation of isomers concurrent with CO-ejection were observed.

3:50 - 4:05 pm | Break

4:05 - 4:35 pm | Christopher Elles, University of Kansas, USA

Excited-State Resonance Raman Spectroscopy as a Probe of Higher-Lying States

Vibrational mode-specific enhancements in resonance Raman spectroscopy reveal the initial dynamics of a wave packet following optical excitation to the upper electronic state. This talk describes experiments that probe the dynamics of molecules in higher-lying electronic states (above S1 and T1) using excited-state resonance Raman spectroscopy.

4:35 - 5:05 pm | Paul Champion, Northeastern University, USA

Vibrational Excitations and Their Role in Energy Transport and Proton Tunneling in Biological Systems

Proton transport in biological systems is a highly evolved process. The coupling of donor and acceptor atoms to vibrational excitations influences the conditions under which tunneling becomes the preferred method of transport. Vibrationally induced proton tunneling in proteins is discussed in the context of both enzymatic activity and transport via “proton wires”.

5:05 - 5:30 | Awards Presentations