自由氖团簇中的飞秒级原子间库仑衰变：表面与体相之间的巨大寿命差异。
Femtosecond interatomic Coulombic decay in free neon clusters: large lifetime differences between surface and bulk.
作者信息
Ohrwall G, Tchaplyguine M, Lundwall M, Feifel R, Bergersen H, Rander T, Lindblad A, Schulz J, Peredkov S, Barth S, Marburger S, Hergenhahn U, Svensson S, Björneholm O
机构信息
Department of Physics, Uppsala University, Box 530, S-751 21 Uppsala, Sweden.
出版信息
Phys Rev Lett. 2004 Oct 22;93(17):173401. doi: 10.1103/PhysRevLett.93.173401. Epub 2004 Oct 19.
A quantitative determination of 2s vacancy lifetimes in surface and bulk atoms of free Ne clusters has been made. While for free atoms the 2s inner-valence hole has a ps lifetime, it reduces to 6+/-1 fs for cluster bulk atoms. For surface atoms, the lifetime is on average longer than 30 fs. The lifetime estimate was obtained from fits of high-resolution photoelectron spectra of Ne clusters. The shortening of the lifetime is attributed to the coordination dependent interatomic Coulombic decay, which is extremely sensitive to internuclear distances.
已对自由氖团簇的表面和体相原子中的2s空穴寿命进行了定量测定。对于自由原子，2s内价层空穴的寿命为皮秒级，而对于团簇体相原子，其寿命缩短至6±1飞秒。对于表面原子，寿命平均超过30飞秒。寿命估计值是通过对氖团簇的高分辨率光电子能谱进行拟合得到的。寿命的缩短归因于依赖配位的原子间库仑衰变，这种衰变对核间距极其敏感。
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