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:

Chris Kaplan

Ashley Fidler

Yuki Kobayashi

Hung-Tzu Chang

Kristina Chang

Andrew Ross

Hugo Marroux

Alexander Guggenmos

Romain Geneaux

Lou Barreau

Recent publications:

♦ "Selectivity of electronic coherence and attosecond ionization delays in strong-field double ionization" Y. Kobayashi, M. Reduzzi, K. F. Chang, D. M. Neumark, S. R. Leone, Phys. Rev. Lett. 120, 233201 (2018). pdf

♦ "Enhanced high-order harmonic generation driven by a wavefront corrected high-energy laser" Y. Wang, T. Guo, J. Li, J. Zhao, X. Ren, J. Li, Y. Wu, M. Weidman, Z. Chang, J. Phys. B: At. Mol. Opt. Phys. 51, 134005 (2018). pdf

♦ "Femtosecond tracking of carrier relaxation in germanium with extreme ultraviolet transient reflectivity" C. J. Kaplan, P. M. Kraus, A. D. Ross, M. Zürch, S. K. Cushing, M. F. Jager, H.-T. Chang, E. M. Gullikson, D. M. Neumark, S. R. Leone, Phys. Rev. B 97, 205202 (2018). pdf

♦ "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

Additional information: