The effects of dynamics and dissipation on ultrafast intersystem crossings are studied for a dissipative two-level system coupled to a local vibronic mode. A method of amplitude damping of the wave packet is presented that accounts better for the position of the wave packet and avoids spurious transitions between potential wells. It is demonstrated that Fermi's golden rule, the typical semiquantitative approach to extract population transfer rates from potential landscapes, only holds under limited conditions. Generally, the effects of dynamics and dissipation lead to deviations from the expected exponential population transfer, strong changes in transfer times and total population transfer, and significant recurrence or "spill back" of the wave packet.

中文翻译：

---

超快速系统间穿越的耗散和动力学。

对于耦合到局部振动模式的耗散两级系统，研究了动力学和耗散对超快系统间交叉的影响。提出了一种对波包进行振幅阻尼的方法，该方法可以更好地说明波包的位置，并避免潜在阱之间的虚假过渡。事实证明，费米的黄金法则是从潜在景观中提取人口转移率的典型半定量方法，仅在有限的条件下成立。通常，动力学和耗散的影响导致与预期的指数种群转移背离，转移时间和总种群转移发生强烈变化，并且波包大量重复出现或“溢出”。