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This work studies the relaxation dynamics of molecules in both the
gas and liquid phases after strong field ionization, using
transient absorption in the soft X-rays. In particular, the thesis
presents the first realization of time-resolved X-ray absorption
spectroscopy in the spectral water window with a laser-based HHG
source. These remarkable experiments were not only performed for
isolated molecules, but also in liquids, for which the spectral
coverage of the K-edges of C, N, and O are of primary importance
for investigating biological molecules. The technique relies on the
generation of high-order harmonics to further probe the electronic
structure of molecules. Using the atomic selectivity of high
energies and the temporal coherence of laser technology, we
demonstrate the observation of the first stages of chemical
transformation of matter in the gas and liquid phases.
This work studies the relaxation dynamics of molecules in both the
gas and liquid phases after strong field ionization, using
transient absorption in the soft X-rays. In particular, the thesis
presents the first realization of time-resolved X-ray absorption
spectroscopy in the spectral water window with a laser-based HHG
source. These remarkable experiments were not only performed for
isolated molecules, but also in liquids, for which the spectral
coverage of the K-edges of C, N, and O are of primary importance
for investigating biological molecules. The technique relies on the
generation of high-order harmonics to further probe the electronic
structure of molecules. Using the atomic selectivity of high
energies and the temporal coherence of laser technology, we
demonstrate the observation of the first stages of chemical
transformation of matter in the gas and liquid phases.
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