Ultrafast coherent control in the electronic ground state of a molecule

被引:3
作者
Heid, M [1 ]
Chen, T [1 ]
Pausch, R [1 ]
Schwoerer, H [1 ]
Kiefer, W [1 ]
机构
[1] Univ Wurzburg, Inst Phys Chem, D-97074 Wurzburg, Germany
关键词
coherent control; selective generation of electronic ground state vibrational wave packets; ultrafast stimulated Raman process;
D O I
10.1002/jccs.200000087
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
We report on a coherent control experiment to selectively excite a well localized nuclear probability density in the electronic ground state of isolated, jet cooled potassium dimer molecules. The basic idea of this control scheme is to take advantage of the motion of a vibrational wave packet created in an intermediate excited electronic state, from which a Franck-Condon window to the desired final state in the ground state emerges. To realize this concept we apply a resonant stimulated Raman process, in which the two involved laser pulses are separated by a time delay tau(1) and their wavelengths are independently tunable. The method enables us to excite ground state vibrational wave packets, whereby the vibrational energy of the wave packet and the position of its generation along the internuclear separation coordinate of the ground state potential energy surface can in principle be freely chosen by the experimentalist. The results we present for the chosen model system K-2 strongly support the idea that this control concept might be one possible approach to selectively populate a desired chemical reaction channel in the electronic ground state of a molecule.
引用
收藏
页码:637 / 645
页数:9
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