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Ultrafast extreme ultraviolet induced isomerization of acetylene cations.
Y H Jiang
1 ,
A Rudenko ,
O Herrwerth ,
L Foucar ,
M Kurka ,
K U Kühnel ,
M Lezius ,
M F Kling ,
J van Tilborg ,
A Belkacem ,
K Ueda ,
S Düsterer ,
R Treusch ,
C D Schröter ,
R Moshammer ,
J Ullrich
Dec 31 2010
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Abstract
Ultrafast isomerization of acetylene cations ([HC=CH](+)) in the low-lying excited A(2)Σ(g)(+) 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.