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

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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.

Molecules studied:

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

Information obtained:

Time-resolved wavefunctions of electrons

Project members:

Erika Warrick

Ashley Fidler

Wei Cao

Recent publications:

♦ "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

♦ "Noncollinear wave mixing of attosecond XUV and few-cycle optical laser pulses in gas-phase atoms: Toward multidimensional spectroscopy involving XUV excitations" W. Cao, E. R. Warrick, A. Fidler, D. M. Neumark, S. R. Leone, Phys. Rev. A 94, 053846 (2016). pdf

♦ "Near-resonant four-wave mixing of attosecond extreme-ultraviolet pulses with near-infrared pulses in neon: Detection of electronic coherences" W. Cao, E. R. Warrick, A. Fidler, S. R. Leone, D. M. Neumark, Phys. Rev. A 94, 021802(R) (2016). pdf

♦ "Probing the Dynamics of Rydberg and Valence States of Molecular Nitrogen with Attosecond Transient Absorption Spectroscopy" E. R. Warrick, W. Cao, D. M. Neumark, S. R. Leone, J. Phys. Chem. A 120, 3165-3174 (2016). pdf

Additional information: