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The possible role of neutral PAHs as catalysts for H2 formation in the
interstellar medium is investigated by a combined experimental and density function theory
study of the superhydrogenation of coronene (C24H12). The
calculations suggest efficient hydrogenation of both edge and centre sites, along with
competing abstraction reactions to form H2 in a series of catalytic cycles.
Scanning tunneling microscopy and thermal desorption measurements have been used to
provide direct evidence of the formation of superhydrogenated coronene as a result of
exposure to D atoms. Lower limit estimates for the cross-sections of
1.8 × 10-17, 5.5 × 10-18 and 1.1 × 10-18 cm2
for the formation of singly, doubly and triply hydrogenated coronene are derived. The
results suggest that superhydrogenated PAHs may play an important role in H2
formation in the ISM.
The spin resolved electronic structure of ultra-thin Fe films on Cu(100) was investigated using spin polarized angle resolved photoemission spectroscopy. All exchange splitting of the Fe ∆s band of 2.5 eV is observed for photon energies between 20 and 30 eV. ∆ peak at 6 eV binding energy which has been previously identified as a many-electron resonance was observed only after contamination of the films with oxygen. In addition, the spin dependent attenuation lengths for electrons in Fe were measured at 11, 19, and 40 eV above Ef. The attenuation length for the minority spin electrons was found to be shorter than that of the majority spin electrons. The difference between the two attenuation lengths was shown to increase at low energy. Short attenuation lengths of ≃3 monolayer were measured at II eV. The large increase of the attenuation length at low energy which is expected from the “universal curve” is not observed in Fe.
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