Click the icon to connect to the Zoom link. It is the same for all the days of the main conference. The passcode is “TRVS2021”.
Chair: Kevin Kubarych, University of Michigan
8:30 - 9:00 | Introduction and Opening Remarks
General remarks and information about the unique nature of this conference. We will explain how to access the Gather site and describe the poster sessions and game events.
9:00 - 9:30 am | Tahei Tahara, RIKEN, Japan
Ultrafast dynamics at the water surface revealed by time-resolved HD-VSFG spectroscopy
We investigated ultrafast vibrational and photochemical dynamics at the air/water interface using time-resolved heterodyne-detected vibrational sum-frequency generation spectroscopy. The data obtained clearly show very unique dynamics that reflect peculiar environments provided by the water interface.
9:30 - 10:00 am | Mischa Bonn, MPI Polymer Research, Germany
Vibrational Mode Coupling in Water Revealed by Two-Dimensional Terahertz-Infrared-Visible Spectroscopy
We present a newly developed femtosecond laser-based spectroscopy to quantify the coupling between high- and low-frequency molecular vibrations. We illustrate the approach on liquid water, and reveal coupling between the high-frequency OH stretch and low-frequency hydrogen-bond and librational modes. We also report the effect of ions on the coupling.
10:00 - 10:20 am | Misao Mizuno, Osaka University, Japan
Characterization of the chromophore structure in the photocycle of a new type of chloride ion-pumping rhodopsin
The chromophore structure of the photointermediates of a newly identified chloride ion-pumping rhodopsin, Nonlabens marinus rhodopsin 3, was characterized using time-resolved resonance Raman spectroscopy. It is demonstrated that the chromophore structure of the intermediates is insensitive to the characteristic motif near the retinal chromophore to determine the pumped ions.
10:20 - 10:35 am | Break
10:35 - 11:05 am | Thomas Elsaesser, Max Born Institute, Germany
Electric Interactions and Structure of Hydrated RNA: 2D-IR Spectroscopy and Theoretical Simulations
Backbone vibrations of short double-helical RNA and transfer RNA (tRNA) are noninvasive probes of electric interactions with counterions and water molecules in the hydration shell. Contact pairs of phosphate groups and Mg2+ ions are discerned in 2D-IR spectra and play a decisive role for stabilizing tRNA structure.
11:05 - 11:35 am | Ellen Backus, University of Vienna, Austria
Interfacial Vibrational Dynamics of Ice Ih and Liquid Water
Understanding ice surfaces is important for atmospheric chemistry. Using infrared pump and sum frequency generation probe spectroscopy, the interfacial vibrational dynamics can be unraveled. A comparison to liquid water surfaces, reveals accelerated vibrational energy relaxation at the ice surface for hydrogen-bonded OH groups and deceleration for free OH groups.
11:35 - 11:55 am | Manuel Joffre, Ecole Polytechnique, France
Pump-probe vibrational spectroscopy in Fatty Acid Photodecarboxylase, from picoseconds to microseconds
Using Arbitrary Detuning Asynchronous Optical Sampling (ADASOPS), we performed multiscale time resolved vibrational spectroscopy in Fatty Acid Photodecarboxylase (FAP). Carbon dioxide released from the fatty acid is monitored through its vibrational signature, shedding new light on the mechanisms involved in this recently-discovered photoenzyme.
11:55 - 12:10 pm | Break
Chair: Jennifer Ogilvie, University of Michigan
12:10 - 12:40 pm | Michael Fayer, Stanford University, USA
Dynamics of Thin Films of Ionic Liquids and the Effects of Surface Functionalization
Ultrafast 2D IR was used to investigate the dynamics of IL thin films, 10s of nm to several hundred nm. The dynamics of the films become increasingly slow as the films become thinner. By controlling the nature of surface functionalization, the dynamics of thin IL films can be systematically controlled.
12:40 - 1:10 pm | Shahaf Asban, University of California Irvine, USA
Time-resolved interferometric-spectroscopy with quantum-light: revealing out-of-time-ordering correlators
We survey the inclusion of interferometric elements in multidimensional spectroscopy performed with quantum light. These introduce utterly different control knobs and enable to manipulate the time ordering of matter correlators, generating higher dimensional signals. Such signals are unique to quantum light, inaccessible using ordinary multidimensional spectroscopy.
1:10 - 1:30 pm | Daniel Kuroda, Louisiana State University, USA
Structure and dynamics of the lithium salts solutions in acetonitrile from low to high concentrations
The effect of concentration in the microscopic organization of lithium salts in acetonitrile were investigated using IR spectroscopies in combination with theoretical methods. Our studies revealed a substantial difference in the dynamics of the solvent molecules directly coordinating the lithium ion and attributed it to different molecular mechanisms.
1:30 - 1:45 pm | Break
1:45 - 2:15 pm | Igor Rubtsov, Tulane University, USA
Initiation of unidirectional ballistic energy transport in oligomeric chains
Oligomeric chains are capable of transporting coherent wavepackets of vibrational energy with high speed and efficiency. We describe mechanisms of transport initiation of such wavepackets using IR-active chain end groups. The findings are tested on two chain types: linear alkane and oligo(p-phenylene), providing suggestions for optimizing the wavepacket formation process.
2:15 - 2:35 pm | Laura Kiefer, University of Michigan, USA
Transmission Mode 2D-IR Spectroelectrochemistry of In Situ Electrocatalytic Intermediates
2D-IR combined with electrochemistry was used to characterize structure and dynamics of electrocatalysis intermediates of a rhenium CO2 reduction catalyst in situ. Transmission mode geometries are widely used in catalysis research, and our results show that this electrochemistry technique is well suited for ultrafast spectroscopy.
2:35 - 2:50 pm | Break
Chair: Carlos Baiz, University of Texas
2:50 - 3:20 pm | Jeffrey Owrutsky, Naval Research Laboratory, USA
Dynamics of Vibration-Cavity Polaritons
Two-dimensional infrared and filtered pump–probe spectroscopy are used to demonstrate spectroscopic responses and relaxation dynamics of excited vibration-polaritons formed from the cavity-coupled NO band of nitroprusside in methanol. The polariton features decay more slowly than the polariton dephasing time, which indicates that they represent incoherent polariton population.
3:20 - 3:50 pm | Wei Xiong, University of California San Diego, USA
Ultrafast Dynamics and Interactions of Molecular Vibrational Polaritons
Molecular vibrational polaritons are hybrid half-light, half-matter quasiparticles, which have interesting properties from both sides. Using pump-probe and 2D IR spectroscopy to study vibrational-polaritons, we learned interesting dynamics that advance both polariton and spectroscopy fields.
3:50 - 4:05 pm | Break
4:05 - 4:35 pm | Munira Khalil, University of Washington, USA
Extracting vibronic couplings from two-dimensional multicolor experiments
This talk will provide examples of how 2D electronic-vibrational and 2D vibrational-electronic spectroscopies can be used to obtain vibronic couplings in molecular systems.
4:35 - 5:05 pm | Andrew Moran, University of North Carolina, USA
Investigating Photochemical Dynamics with Two-Dimensional Resonance Raman Spectroscopy
In this talk, I will describe the development of a two-dimensional resonance Raman technique capable of correlating motions of reactants and products in ultrafast photochemical processes. Applications of this method to photodissociation reactions in triiodide and myoglobin provide insights into the reaction dynamics and line broadening mechanisms.
5:05 - 5:35 pm | Graham Fleming, University of California Berkeley, USA
Two-dimensional electronic-vibrational spectroscopy
Two-dimensional electronic-vibrational (2DEV) spectroscopy is a newly emerging spectroscopy that reports on cross correlations between fluctuations of electronic and vibrational transitions. For complex systems it can often give significantly higher spectral resolution than other electronic spectroscopies. Applications to proton coupled electron transfer, photosynthetic energy transfer and vibronic coupling will be described.