Unexpectedly broad photoelectron spectrum as a signature of ultrafast electronic relaxation of Rydberg states of carbon dioxide
Unexpectedly broad photoelectron spectrum as a signature of ultrafast electronic relaxation of Rydberg states of carbon dioxide
复制标题
出乎意料的宽光电子能谱是二氧化碳里德堡态超快电子弛豫的标志
DOI：
10.1103/physreva.95.033422
复制
发表时间：
2017
影响因子：
2.9
通讯作者：
S. Yu. Grebenshchikov
中科院分区：
文献类型：
--
作者：
A. Adachi;M. Sato;T. Suzuki;S. Yu. Grebenshchikov
用时间分辨光电子成像法研究了低于电离阈值0.2 eV激发进入里德堡态的动力学。在所有泵浦-探测延迟时间内，测量了超过3 eV的宽光电子能谱。量子力学计算表明，光谱展宽是由里德堡态的超快电子驰豫引起的，并确定了可能的驰豫途径。实验和理论将弛豫时间定在15秒到65秒之间。一个微弱的与时间无关的电离信号被归因于捕获在近阈值三重态。
The dynamics ofexcited into Rydberg states lying 0.2 eV below the ionization threshold is studied by means of time resolved photoelectron imaging. Over 3 eV broad photoelectron spectra are measured for all pump-probe delay times. Quantum mechanical calculations demonstrate that the spectral broadening is due to ultrafast electronic relaxation of Rydberg states and identify the likely relaxation pathways. Experiment and theory bracket the relaxation time between 15 and 65 fs. A weak time independent ionization signal is attributed totrapped in near-threshold triplet states.