Quantum Control of Nuclear Motion at a Metal Surface
Quantum Control of Nuclear Motion at a Metal Surface
复制标题
金属表面核运动的量子控制
DOI：
10.1021/jp001218a
复制
发表时间：
2000
影响因子：
2.9
通讯作者：
S. Ogawa
中科院分区：
文献类型：
--
作者：
H. Petek;H. Nagano;M. Weida;S. Ogawa
在Cs/Cu（111）体系中证明了表面光化学反应的量子控制的可能性。相干核子波包运动诱导的共振偶极激发与3.08 eV的光从占用的表面状态固有的Cu（111）表面的未占用的Cs反键态的Cs原子覆盖率为0.1单层。干涉时间分辨双光子光电子能谱测量表明，两个状态之间的偏振引起的衰减在25 fs。这使得可以通过激发场的相位来控制激发态波包的位置和动量。用相位相关的<20 fs脉冲对或单个啁啾激光脉冲激发，证明了量子控制。双光子光电子能谱的相位依赖性表明了Cs原子的脱附运动受到控制。
The possibility of quantum control of surface photochemical reactions is demonstrated for the system of Cs/Cu(111). Coherent nuclear wave packet motion is induced by resonant dipole excitation with 3.08 eV light from an occupied surface state intrinsic to the Cu(111) surface to an unoccupied Cs antibonding state for a Cs atom coverage of 0.1 monolayer. Interferometric time-resolved two-photon photoemission measurements show that the polarization induced between the two states decays in ∼25 fs. This makes it possible to control the position and momentum of the excited state wave packet through the phase of the excitation field. Quantum control is demonstrated for excitation with phase-related <20 fs pulse pairs or single chirped laser pulses. The phase dependence of two-photon photoemission spectra demonstrates the control of desorptive motion of Cs atoms.