[theochem-announce] Shaul Mukamel theochem seminar TODAY 5/6 @ 4 PM in 4-163

[Michael Mavros]

Hi all,

Prof. Shaul Mukamel of UC Irvine will be giving the last theoretical
chemistry seminar of the semester TODAY from 4-6 PM in 4-163.  His title
and abstract are below.  We hope to see you all there!

*Title:*
Multidimensional Electronic And Vibrational Spectroscopy Of Molecules Using
Attosecond X-Ray Pulses, Optical Pulses, And Quantum Light

*​Abstract:​*
The response of molecules to sequences of ultrafast optical pulses ranging
from the infrared to the hard x-ray regimes provides novel windows into
elementary molecular events and electronic and nuclear motions. Recent
developments in this field involving the use of broadband x-ray pulses and
entangled photons will be surveyed. New x-ray light sources are capable of
triggering valence electron motions impulsively by a stimulated resonant
Raman process via core excitations and monitoring them with high temporal
and spatial resolution. Attosecond x-ray pulses can probe quantum coherence
and correlations of valence electron and hole pairs, in an analogous manner
to the way vibrational motions are investigated using femtosecond Raman
techniques in the visible regime. By creating multiple core holes at
controlled times and locations it becomes possible to study the dynamics
and correlations of valence electrons as they respond to core hole
perturbations. Applications will be presented to energy transfer in
porphyrin aggregates, long-range biological electron transfer and
multidimensional electron diffraction. A stimulated Raman detection of an
X-ray probe may be used to monitor the phase and the dynamics of the
nonequilibrium valence electronic state wavepacket created by e.g.
photoexcitation, and photoionization. The passage through conical
intersections can be directly monitored by observing electronic coherences.

Quantum spectroscopy utilizes the quantum nature of light to reveal matter
properties not available with classical light. Quantum spectroscopy signals
are recorded by varying parameters of the photon wavefunction rather than
classical field envelopes. Entangled photons provide novel nonlinear
spectroscopic probes of excitation energy transfer and charge separation
processes in chromophore aggregates. The unusual spectral and temporal
characteristics of entangled photon pairs combined with interferometric
detection make it possible to manipulate and control multiple exciton
states in photosynthetic reaction centers.

1. "Monitoring Long-range Electron Transfer in Proteins by Stimulated
Broadband X-Ray Raman Spectroscopy", Yu Zhang, J.D. Biggs, Niri Govind, and
Shaul Mukamel. JPC Lett, 5, 3656-3661 (2014)

2. "Stimulated Raman Spectroscopy with Entangled Light; Enhanced Resolution
and Pathway Selection", K. Dorfman, F. Schlawin, and S. Mukamel.
dx.doi.org/10.1021/jz501124a | J. Phys. Chem. Lett, 5, 2843-2849 (2014)

3. "Multidimensional Spectroscopy with Entangled Light; Loop vs. Ladder
Delay Scanning Protocols", K.E. Dorfman and S. Mukamel. New J. Phys. 16,
033013 (2014)

4. "Catching Conical Intersections in the Act; Monitoring Transient
Electronic Coherences by Attosecond Stimulated X-ray Raman Signals",
Konstantin Dorfman, Kochise Bennett, Markus Kowalewski, and Shaul Mukamel.
(In preparation, 2015)

-- 
Michael Mavros
Department of Chemistry, Massachusetts Institute of Technology
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