期刊
SCIENCE
卷 312, 期 5772, 页码 424-427出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1123904
关键词
-
资金
- Engineering and Physical Sciences Research Council [EP/C530764/1, GR/S22400/01] Funding Source: researchfish
We demonstrate a technique that uses high-order harmonic generation in molecules to probe nuclear dynamics and structural rearrangement on a subfemtosecond time scale. The chirped nature of the electron wavepacket produced by laser ionization in a strong field gives rise to a similar chirp in the photons emitted upon electron-ion recombination. Use of this chirp in the emitted light allows information about nuclear dynamics to be gained With 100-attosecond temporal resolution, from excitation by an 8-femtosecond pulse, in a single laser shot. Measurements on molecular hydrogen and deuterium agreed well With calculations of ultrafast nuclear dynamics in the H(2)(+) molecule, confirming the validity of the method. We then measured harmonic spectra from CH(4) and CD(4) to demonstrate a few femtosecond time scale for the onset of proton rearrangement in methane upon ionization.
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