The Neumark Group

LPES  


Department of Chemistry, University of California Berkeley
and Chemical Science Division, Lawrence Berkeley National Laboratory

Slow photoelectron velocity-map imaging spectroscopy

Fast beam translational spectroscopy

Femtosecond Time-resolved photoelectron imaging

Molecular beam photodissociation dynamics

Spectroscopy and dynamics in helium droplets

Attosecond spectroscopy

Spectroscopy and dynamics in liquid microjets

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Previous members

Spectroscopets

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Spectroscopy and Dynamics in Liquid Microjets

Synopsis:

Femtosecond time-resolved photoelectron spectroscopy on liquid microjets (LPES) is used to study the ultrafast dynamics of solutes in high vapor pressure solvents. By monitoring the time-evolving kinetic energy of the detached electron, we are able to record transient lifetimes, solvation timescales, and binding energies of a wide variety of species. Recent upgrades to the experiment have extended probe energies into the extreme ultraviolet (XUV), drastically expanding the photophysics accessible for study using this method.


Our current focus is on the photophysics of DNA. In particular, we are interested in building a molecular-level understanding of the short-time dynamics present in nucleic acid constituents (NACs) subsequent to absorbing ultraviolet radiation. Working from simpler systems like solvated nucleobases to the more complex oligonucleotides, we aim to construct a more complete model of DNA photophysics by tracking the complete relaxation dynamics present in these systems.


We're currently looking for a new graduate student to join the project! Please contact Zach if interested.



Molecules studied:

Nucleobases, nucleosides, nucleotides

Solvated electrons

Project members:

Zachary Heim

Negar Baradaran

Masafumi Koga

Recent publications:

♦ "Relaxation Dynamics of Hydrated Thymine, Thymidine, and Thymidine Monophosphate Probed by Liquid Jet Time-Resolved Photoelectron Spectroscopy" B. A. Erickson, Z. N. Heim, E. Pieri, E. Liu, T. J. Martinez, D. M. Neumark, J. Phys. Chem. A 123, 10676 (2019). pdf

♦ "Time-resolved photoelectron spectroscopy of adenosine and adenosine monophosphate photodeactivation dynamics in water microjets" H. L. Williams, B. A. Erickson, D. M. Neumark, J. Chem. Phys. 148, 194303 (2018). pdf

♦ "Isotope effect on hydrated electron relaxation dynamics studied with time-resolved liquid jet photoelectron spectroscopy" M. H. Elkins, H. L. Williams, D. M. Neumark, J. Chem. Phys. 144, 184503 (2016). pdf

♦ "Dynamics of electron solvation in methanol: Excited state relaxation and generation by charge-transfer-to-solvent" M. H. Elkins, H. L. Williams, D. M. Neumark, J. Chem. Phys. 142, 234501 (2015). pdf