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The Neumark Group

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 reactive scattering and photodissociation

Spectroscopy and dynamics in helium droplets

Attosecond spectroscopy

Spectroscopy and dynamics in liquid microjets

Current members

Previous members

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Attosecond Spectroscopy

Synopsis:

Attosecond pulses are produced by nonlinear-optical high-harmonic generation of focused few-cycle phase-stabilized femtosecond laser light in a rare gas target. These pulses are used to illuminate the quantum dynamics and correlated motion of electrons in various systems, including atoms, molecules, clusters and nanoparticles.


See also: Leone group, attosecond dynamics in atoms/molecules and semiconductors

Molecules studied:

small molecules (N2, SF6), clusters (Nen), metal nanoparticles

Information obtained:

Time-resolved wavefunctions of electrons

Project members:

Erika Warrick

Marieke Jager

Chris Kaplan

Ashley Fidler

Yuki Kobayashi

Hung-Tzu Chang

Peter Kraus

Michael Zurch

Kristina Chang

Andrew Ross

Hugo Marroux

Recent publications:

♦ "Direct and simultaneous observation of ultrafast electron and hole dynamics in germanium" M. Zurch, H.-T. Chang, L. J. Borja, P. M. Kraus, S. K. Cushing, A. Gandman, C. J. Kaplan, M. H. Oh, J. S. Prell, D. Prendergast, C. D. Pemmaraju, D. M. Neumark, S. R. Leone, Nature Comm., 8, 15734 (2017). pdf

♦ "Ultrafast carrier thermalization and trapping in silicon-germanium alloy probed by extreme ultraviolet transient absorption spectroscopy" M. Zurch, H.-T. Chang, P. M. Krauss, S. K. Cushing, L. J. Borja, A. Gandman, C. J. Kaplan, M. H. Oh, J. S. Prell, D. Prendergast, C. D. Pemmaraju, D. M. Neumark, S. R. Leone, Struct. Dyn. 4, 044029 (2017). pdf

♦ "Attosecond transient-absorption dynamics of xenon core-excited states in a strong driving field" Y. Kobayashi, H. Timmers, M. Sabbar, S. R. Leone, D. M. Neumark, Phys. Rev. A 95, 031401 (2017). pdf

♦ "Attosecond transient absorption spectroscopy of molecular nitrogen: Vibrational coherences in the b' 1Σu+ state" E. R. Warrick, J. E. Bækhøj, W. Cao, A. P. Fidler, F. Jensen, L. B. Madsen, S. R. Leone, D. M. Neumark, Chem. Phys. Lett. (2017). pdf

Additional information:

http://atto.lbl.gov