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Article Dans Une Revue Journal of Physics B: Atomic, Molecular and Optical Physics Année : 2010

Soft-x-ray fragmentation studies of molecular ions

Résumé

Imaging of photofragments from molecular ions after irradiation by soft X-ray photons has been realized at the ion beam infrastructure TIFF set up at the FLASH facility. Photodissociation of the two-electron system HeH + at 38.7 eV revealed the electronic excitations and the charge-state ratios for the products of this process, reflecting the non-adiabatic dissociation dynamics through multiple avoided crossings among the HeH + Rydberg potential curves. Dissociative ionization of the protonated water molecules H 3 O + and H 5 O + 2 at 90 eV revealed the main fragmentation pathways after the production of valence vacancies in these ionic species, which include a strong three-body channnel with a neutral fragment (OH + H + + H +) in H 3 O + photolysis and a significant two-body fragmentation channel (H 3 O + + H 2 O +) in H 5 O + 2 photolysis. The measurements yield absolute cross sections and fragment angular distributions. Increased precision and sensitivity of the technique was realized in recent developments, creating a tool for exploring X-ray excited molecular states under highly controlled target conditions challenging detailed theoretical understanding.

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Dates et versions

hal-00569842 , version 1 (25-02-2011)

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Andreas Wolf, Henrik B Pedersen, Lutz Lammich, Brandon Jordon-Thaden, Simon Altevogt, et al.. Soft-x-ray fragmentation studies of molecular ions. Journal of Physics B: Atomic, Molecular and Optical Physics, 2010, 43 (19), pp.194007. ⟨10.1088/0953-4075/43/19/194007⟩. ⟨hal-00569842⟩

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