Probing Proton Dynamics in Molecules on an Attosecond Time Scale

Baker, S.; Robinson, J. S.; Haworth, C. A.; Teng, H.; Smith, R. A.; Chirila, Ciprian C.; Lein, Manfred; Tisch, J. W. G.; Marangos, J. P.

doi:10.1126/science.1123904

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Probing Proton Dynamics in Molecules on an Attosecond Time Scale

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Chirila, Ciprian C.
Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;

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Lein, Manfred
Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;

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引用

Baker, S., Robinson, J. S., Haworth, C. A., Teng, H., Smith, R. A., Chirila, C. C., Lein, M., Tisch, J. W. G., & Marangos, J. P. (2006). Probing Proton Dynamics in Molecules on an Attosecond Time Scale. Science, 312(5772), 424-427. doi:10.1126/science.1123904.

引用: https://hdl.handle.net/11858/00-001M-0000-0011-802B-F

要旨

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 H2+ molecule, confirming the validity of the method. We then measured harmonic spectra from CH4 and CD4 to demonstrate a few-femtosecond time scale for the onset of proton rearrangement in methane upon ionization.