铕原子4f76pns系列自电离态的光谱和动力学过程

薛智丽; 沈礼; 戴长建

doi:10.3788/fgxb20183912.1679

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铕原子4f⁷6pns系列自电离态的光谱和动力学过程

材料合成及性能 | 更新时间：2020-08-12

- 铕原子4f⁷6pns系列自电离态的光谱和动力学过程
- Spectra and Dynamic Properties of Eu 4f⁷6pns Autoionizing States
- 发光学报 2018年39卷第12期页码：1679-1686
- 作者机构：
  
  1. 天津理工大学理学院天津,300384
  2. 天津理工大学显示技术与光电器件教育部重点实验室天津,300384
- 作者简介：
- 基金信息：
  
  国家自然科学基金（11174218）资助项目()
- DOI：10.3788/fgxb20183912.1679
  中图分类号： O433.5+9;O562.3+1
- 收稿日期：2018-03-15，
  
  修回日期：2018-06-04，
  
  网络出版日期：2018-06-13，
  
  纸质出版日期：2018-12-05
- 稿件说明：
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薛智丽, 沈礼, 戴长建. 铕原子4f76pns系列自电离态的光谱和动力学过程[J]. 发光学报, 2018,39(12): 1679-1686

XUE Zhi-li, SHEN Li, DAI Chang-jian. Spectra and Dynamic Properties of Eu 4f76pns Autoionizing States[J]. Chinese Journal of Luminescence, 2018,39(12): 1679-1686
薛智丽, 沈礼, 戴长建. 铕原子4f76pns系列自电离态的光谱和动力学过程[J]. 发光学报, 2018,39(12): 1679-1686 DOI： 10.3788/fgxb20183912.1679.

XUE Zhi-li, SHEN Li, DAI Chang-jian. Spectra and Dynamic Properties of Eu 4f76pns Autoionizing States[J]. Chinese Journal of Luminescence, 2018,39(12): 1679-1686 DOI： 10.3788/fgxb20183912.1679.

摘要

通过共振激发技术和速度影像法对铕原子4f

s（

=7，8）自电离态进行了系统性的研究。首先采用三步共振激发技术探测光谱，通过前两步固定波长的激光将铕原子激发到4f

态上后扫描第三步激光的波长，使得三步激光的能量总和位于铕原子4f

s（

=7，8）自电离态能域附近，从而得到该自电离态的光谱；然后采用速度影像法对其动力学过程进行探测，经过数据分析得到铕原子4f

s（

=7，8）自电离态的衰变分支比和弹射电子的角分布。不仅从光谱中观察到了强烈的组态相互作用并且确定了部分能态的总角动量，从自电离弹射电子角分布中观察到铕原子4f

s（

=7，8）自电离态复杂的物理机制，还在该能域内观测到了粒子数反转。最后，本文还对孤立实激发技术在探测低

值自电离态光谱的适用性进行了讨论。

Abstract

The spectra and dynamic properties of Eu 4f

8) autoionizing states are studied systematically with the resonance-ionization spectroscopy(RIS) and the velocity-map imaging(VMI) techniques. The RIS technique is utilized to obtain the spectra of Eu 4f

8) autoionizing states with the three-step excitation:the wavelengths of the first two-step lasers are fixed

while that of the last-step laser is scanned around the region of the 4f

8) autoionizing states. The VMI technique is used to detect the dynamic process of autoionization

from which the branching ratio(BR) of ions and the angular distribution(AD) of ejected electrons from Eu 4f

6p7s autoionizing states are achieved. The heavy configuration interaction is observed in the spectra of Eu 4f

8) autoionizing states

measured with RIS spectroscopy technique. The present study reveals the profound variations of AD and BR with energy in the region of the 4f

6p7s autoionization resonance

highlighting the complicated nature of the autoionization process for the lowest member of Eu 4f

s autoionization series. Population inversion is observed by analysis of the BR

while the validity of the well-known isolated core excitation(ICE) technique used for obtaining autoionization spectrum is discussed.

关键词

Keywords

references

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