Ultrafast isomerization of acetylene cations ([HC=CH]⁺) in the low-lying excited A²Σg⁺ state, populated by the absorption of extreme ultraviolet (XUV) photons (38 eV), has been observed at the Free Electron Laser in Hamburg, (FLASH). Recording coincident fragments C⁺+CH₂⁺ as a function of time between XUV-pump and -probe pulses, generated by a split-mirror device, we find an isomerization time of 52±15 fs in a kinetic energy release (KER) window of 5.8<KER<8 eV, providing clear evidence for the existence of a fast, nonradiative decay channel.
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Jiang et al. (2010) studied this question.
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