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Title: Ultrafast Extreme Ultraviolet Induced Isomerization of Acetylene Cations

Journal Article · · Physical Review Letters

Ultrafast isomerization of acetylene cations ([HC = CH]{sup +}) in the low-lying excited A{sup 2}{Sigma}{sub g}{sup +} 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{sup +} + CH{sub 2}{sup +} 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.

Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
Accelerator& Fusion Research Division
DOE Contract Number:
DE-AC02-05CH11231
OSTI ID:
1050696
Report Number(s):
LBNL-4842E
Journal Information:
Physical Review Letters, Vol. 105, Issue 26; Related Information: Journal Publication Date: 2010; ISSN 0031-9007
Country of Publication:
United States
Language:
English

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