Soft X-ray-driven femtosecond molecular dynamics

Etienne Gagnon, Predrag Ranitovic, Xiao Min Tong, C. L. Cocke, Margaret M. Murnane, Henry C. Kapteyn, Arvinder S. Sandhu

Research output: Contribution to journalArticlepeer-review

175 Scopus citations

Abstract

The direct observation of molecular dynamics initiated by x-rays has been hindered to date by the lack of bright femtosecond sources of short-wavelength light. We used soft x-ray beams generated by high-harmonic upconversion of a femtosecond laser to photoionize a nitrogen molecule, creating highly excited molecular cations. A strong infrared pulse was then used to probe the ultrafast electronic and nuclear dynamics as the molecule exploded. We found that substantial fragmentation occurs through an electron-shakeup process, in which a second electron is simultaneously excited during the soft x-ray photoionization process. During fragmentation, the molecular potential seen by the electron changes rapidly from nearly spherically symmetric to a two-center molecular potential. Our approach can capture in real time and with angstrom resolution the influence of ionizing radiation on a range of molecular systems, probing dynamics that are inaccessible with the use of other techniques.

Original languageEnglish (US)
Pages (from-to)1374-1378
Number of pages5
JournalScience
Volume317
Issue number5843
DOIs
StatePublished - Sep 7 2007
Externally publishedYes

ASJC Scopus subject areas

  • General

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