通过参与俄歇衰变测量和X射线吸收后的部分离子产率光谱探测O 1s→里德堡激发态O₂的价态特征。

Probing the valence character of O 1s-->Rydberg excited O2 by participator Auger decay measurements and partial ion yield spectroscopy following x-ray absorption.

作者信息

Feifel R, Tanaka T, Kitajima M, Tanaka H, De Fanis A, Sankari R, Karlsson L, Sorensen S, Piancastelli M-N, Prümper G, Hergenhahn U, Ueda K

机构信息

Department of Physics, Uppsala University, Box 530, SE-751 21 Uppsala, Sweden.

出版信息

J Chem Phys. 2007 May 7;126(17):174304. doi: 10.1063/1.2723745.

DOI:10.1063/1.2723745

PMID:17492860

Abstract

The valence character of O 1s-->Rydberg excited O2 is investigated by means of participator Auger decay spectroscopy, performed at selected photon energies across the K-shell resonance region, and by means of partial ion yield x-ray absorption spectroscopy. For several of the excitation energies studied, the authors find substantial sigma*(4Sigmau-, 2Sigmau-) valence character being mixed with nssigma and npsigma (4Sigmau-, 2Sigmau-) Rydberg states. An experimental indication of a coupling between the channels associated with quartet and doublet ion cores is considered and discussed. New spectroscopic constants are derived for the singly ionized X 2Pig state of O2 based on the observation of at least 20 vibrational sublevels.

摘要

通过在K壳层共振区域的选定光子能量下进行的参与式俄歇衰变光谱法以及部分离子产率X射线吸收光谱法，研究了O 1s→里德堡激发态O₂的价态特征。对于所研究的几个激发能量，作者发现大量的σ*(4Σu⁻, 2Σu⁻)价态特征与nssigma和npsigma(4Σu⁻, 2Σu⁻)里德堡态混合。考虑并讨论了与四重态和双重态离子核相关的通道之间耦合的实验迹象。基于对至少20个振动子能级的观测，推导出了O₂单电离X ²Πg态的新光谱常数。