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:

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:

Ashley Fidler

Hung-Tzu Chang

Andrew Ross

Yen-Cheng Lin

Nicolette Puskar

Recent publications:

♦ "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

♦ "Theoretical analysis of the role of complex transition dipole phase in XUV transient-absorption probing of charge migration" Y. Kobayashi, D. M. Neumark, S. R. Leone Optics Express 30 5673 (2022). pdf

♦ "Solid state core-exciton dynamics in NaCl observed by tabletop attosecond four-wave mixing spectroscopy" J. Gaynor, A. P. Fidler, Y. -C. Lin, H. T. Chang, D. M. Neumark, S. R. Leone Phys. Rev. B 103, 245140 (2021). pdf

♦ "Mapping wave packet bifurcation at a conical intersection in CH3I by attosecond XUV transient absorption spectroscopy" K. F. Chang, H. Wang, D. Prendergast, D. M. Neumark, S. R. Leone J. Chem. Phys. 154, 234201 (2021). pdf

Additional information: