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 photodissociation dynamics

Spectroscopy and dynamics in helium droplets

Attosecond spectroscopy

Spectroscopy and dynamics in liquid microjets

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Attosecond Spectroscopy


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:

Marieke Jager

Chris Kaplan

Ashley Fidler

Yuki Kobayashi

Hung-Tzu Chang

Peter Kraus

Michael Zurch

Kristina Chang

Andrew Ross

Hugo Marroux

Alexander Guggenmos

Recent publications:

♦ "Excited-state vibronic wave-packet dynamics in H2 probed by XUV transient four-wave mixing" W. Cao, E. R. Warrick, A. Fidler, S. R. Leone, D. M. Neumark. Phys. Rev. A 97, 023401 (2018). pdf

♦ "Attosecond transient absorption instrumentation for thin film materials: Phase transitions, heat dissipation, signal stabilization, timing correction, and rapid sample rotation" M. F. Jager, C. Ott, C. J. Kaplan, P. M. Kraus, D. M. Neumark, S. R. Leone, Rev. Sci. Instrum. 89, 013109 (2018). pdf

♦ "Tracking the insulator-to-metal phase transition in VO2 with few-femtosecond extreme UV transient absorption spectroscopy" M. F. Jager, C. Ott, P. M. Kraus, C. J. Kaplan, W. Pouse, R. E. Marvel, R. F. Haglund, D. M. Neumark, S. R. Leone, Proc. Natl. Acad. Sci. USA (2017). pdf

♦ "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

Additional information: