超快极端紫外光诱导乙炔阳离子的异构化。
Ultrafast extreme ultraviolet induced isomerization of acetylene cations.
机构信息
Max-Planck-Institut für Kernphysik, Heidelberg, Germany.
出版信息
Phys Rev Lett. 2010 Dec 31;105(26):263002. doi: 10.1103/PhysRevLett.105.263002. Epub 2010 Dec 22.
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.
在汉堡自由电子激光（FLASH）中，通过吸收极紫外（XUV）光子（38 eV），观察到乙炔阳离子(HC=CH)在低激发 A(2)Σ(g)(+)态的超快异构化。通过分束镜装置产生的 XUV 泵浦和探测脉冲之间，记录碎片 C(+) + CH2(+)的时间，我们发现异构化时间为 52±15 fs，在动能释放（KER）窗口为 5.8<KER<8 eV 时，为快速非辐射衰减通道的存在提供了明确的证据。
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