Attosecond quantum-beat spectroscopy in helium

Niranjan Shivaram, Xiao Min Tong, Henry Timmers, Arvinder Sandhu

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


The evolution of electron wavepackets determines the course of many physical and chemical phenomena, and attosecond spectroscopy aims to measure and control such dynamics in real time. Here, we investigate radial electron wavepacket motion in helium by using an XUV attosecond pulse train to prepare a coherent superposition of excited states and a delayed femtosecond IR pulse to ionize them. Quantum-beat signals observed in the high resolution photoelectron spectrogram allow us to follow the field-free evolution of the bound electron wavepacket and determine the time-dependent ionization dynamics of the low-lying 2p state.

Original languageEnglish (US)
Article number055601
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Issue number5
StatePublished - Feb 9 2016


  • attosecond
  • femtosecond
  • helium
  • photoelectron
  • quantum beat
  • wavepacket

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics


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