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

Flat liquid jet molecular beam scattering

Spectroscopy and dynamics in helium droplets

Attosecond spectroscopy

Spectroscopy and dynamics in liquid microjets

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Previous members


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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:

atoms (He, Kr, Xe), diatomics (N2, IBr, O2), fundamental organic systems (alkyl bromides and iodides), and solid materials (Si, Ge)

Information obtained:

Time-resolved wavefunctions of electrons

Project members:

James Gaynor

Patrick Rupprecht

Yen-Cheng Lin

Nicolette Puskar

Recent publications:

♦ "Femtosecond symmetry breaking and coherent relaxation of methane cations via x-ray spectroscopy" E. Ridente, D. Hait, E. A. Haugen, A. D. Ross, D. M. Neumark, M. Head-Gordon, S. R. Leone Science, 380, 713–717 (2023). pdf

♦ "Measuring autoionization decay lifetimes of optically forbidden inner valence excited states in neon atoms with attosecond noncollinear four-wave-mixing spectroscopy" N. G. Puskar, Y. C. Lin, J. D. Gaynor, M. C. Schuchter, S. Chattopadhyay, C. Marante, A. P. Fidler, C. L. Keenan, L. Argenti, D. M. Neumark, S. R. Leone, Physical Review A, 107, 033117 (2023). pdf

♦ "Nonresonant coherent amplitude transfer in attosecond four-wave-mixing spectroscopy" J. D. Gaynor, A. P. Fidler, Y. Kobayashi, Y. C. Lin, C. L. Keenan, D. M. Neumark, S. R. Leone, Physical Review A, 107, 023526 (2023). pdf

♦ "State-selective probing of CO2 autoionizing inner valence Rydberg states with attosecond extreme ultraviolet four-wave-mixing spectroscopy" A. P. Fidler, Y. C. Lin, J. D. Gaynor, C. W. McCurdy, S. R. Leone, R. R. Lucchese, D. M. Neumark Phys. Rev. A 106, 063525 (2022). pdf

♦ "Conical intersection and coherent vibrational dynamics in alkyl iodides captured by attosecond transient absorption spectroscopy" K. F. Chang, H. Wang, S. M. Poullain, J. Gonzalez-Vasque L. Banares, D. Prendergast, D. M. Neumark, S. R. Leone J. Chem. Phys 156, 114304 (2022). pdf

Additional information: