Liu Kunlong, Zhang Qingbin, Lan Pengfei, Lu Peixiang
Wuhan National Laboratory for Optoelectronics and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China.
Opt Express. 2013 Feb 25;21(4):5107-16. doi: 10.1364/OE.21.005107.
We have theoretically studied the effect of nuclear mass on electron localization in dissociating H₂⁺ and its isotopes subjected to a few-cycle 3-μm pulse. Our results reveal an anomalous isotopic effect in which the degree of electron-directed reactivity can be even higher for heavier isotopes in the intense midinfrared field. We show, for the first time, the pronounced electron localization can be established through the interferences among the multi-photon coupling channels. Due to the relative enhancement of higher-order coupling channels with growing mass, the interference maxima at different kinetic energy of the spectra gradually become in phase, ultimately resulting in the larger dissociation asymmetries of heavier isotopes.
我们从理论上研究了核质量对解离的H₂⁺及其同位素在几周期3微米脉冲作用下电子局域化的影响。我们的结果揭示了一种反常同位素效应，即在强中红外场中，较重同位素的电子定向反应程度甚至可能更高。我们首次表明，通过多光子耦合通道之间的干涉可以建立明显的电子局域化。由于高阶耦合通道随质量增加而相对增强，光谱中不同动能处的干涉极大值逐渐同相，最终导致较重同位素的解离不对称性更大。
