Institute for Optics and Quantum Electronics, Friedrich Schiller University Jena, Max-Wien-Platz 1, 07743 Jena, Germany and Helmholtz-Institut Jena, Helmholtzweg 4, D-07743 Jena, Germany.
Phys Rev Lett. 2013 Aug 30;111(9):093002. doi: 10.1103/PhysRevLett.111.093002. Epub 2013 Aug 27.
Measurements and calculations of the absolute carrier-envelope-phase (CEP) effects in the photodissociation of the simplest molecule, H2(+), with a 4.5-fs Ti:sapphire laser pulse at intensities up to (4±2)×10(14) W/cm2 are presented. Localization of the electron with respect to the two nuclei (during the dissociation process) is controlled via the CEP of the ultrashort laser pulses. In contrast to previous CEP-dependent experiments with neutral molecules, the dissociation of the molecular ions is not preceded by a photoionization process, which strongly influences the CEP dependence. Kinematically complete data are obtained by time- and position-resolved coincidence detection. The phase dependence is determined by a single-shot phase measurement correlated to the detection of the dissociation fragments. The experimental results show quantitative agreement with ab initio 3D time-dependent Schrödinger equation calculations that include nuclear vibration and rotation.
测量和计算最简单分子 H2(+)在光解过程中的绝对载波包络相位 (CEP) 效应，所用激光脉冲为 4.5fs 的钛宝石激光器，强度高达 (4±2)×10(14) W/cm2。通过超短激光脉冲的 CEP 控制电子相对于两个原子核的定位（在解离过程中）。与以前使用中性分子的 CEP 相关实验不同，分子离子的解离过程不是由光致电离过程引起的，这强烈影响了 CEP 的依赖性。通过时间和位置分辨的符合检测获得了完整的动力学数据。相位依赖性通过与解离碎片检测相关的单次相位测量来确定。实验结果与包括核振动和旋转的 3D 含时薛定谔方程的从头算计算结果定量一致。
