Origin of threshold electrons produced in decay of the Xe 4d−1 np resonance |
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| Institution: | 1. KEK-PF, Tsukuba, Ibaraki 305-0801, Japan;2. IMS, Okazaki, Aichi 444-8585, Japan;3. DIAM, Université P. & M. Curie, 75252 Paris 5, France;4. LURE, Université Paris-Sud, 91898 Orsay, France;1. Indus Synchrotrons Utilization Division Raja Ramanna Centre for Advanced Technology, Indore 452013, India;2. Sorbonne Universités, UPMC Univ Paris 06, Laboratoire de Chimie Physique – Matière et Rayonnement, 4 Place Jussieu, F-75252 Paris Cedex 05, France;3. CNRS UMR 7614, Laboratoire de Chimie Physique – Matière et Rayonnement, 4 Place Jussieu, F-75252 Paris Cedex 05, France;4. National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan;1. Arkansas Center for Laser Applications and Science (ARCLAS), Department of Chemistry and Physics, Arkansas State University, State University, AR 72467, United States;2. Department of Mechanical Engineering, Embry Riddle Aeronautical University, 600 S. Clyde Morris Boulevard, Daytona Beach, FL 32114, United States;1. University of Minnesota, Integrated BioSciences, 1035 University Drive, SMed 223, Duluth, MN 55812-3031, USA;2. University of Minnesota Medical School – Duluth, 1035 University Drive, Duluth, MN 55812-3031, USA;3. Peromyscus Genetic Stock Center University of South Carolina Office of Research, Columbia, SC 29208, USA;1. Institute for Sustainable Sciences and Development, Hiroshima University, Higashi-Hiroshima 739-8526, Japan;2. Theoretical Chemistry, Institute of Physical Chemistry, Heidelberg University, 69120 Heidelberg, Germany;3. Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Sendai 980-8577, Japan |
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| Abstract: | Coincidence spectra of energetic electrons with threshold electrons were measured following photo-excitation of the Xe 4d3/2, 5/2 → np resonances, in order to investigate the origin of threshold electrons, and the mechanism leading to formation of the Xe2+ 5p−2 and 5s−15p−1 final states. A two-step decay process was observed in the production of Xe2+ 5p−2(1D) following decay of the 7p resonance, where the intermediate state is Xe+* 5p−2(1S)8p that autoionizes emitting a pseudo-threshold electron. This process was confirmed in a time-of-flight analysis of the coincidence spectra of the energetic electrons with the threshold photoelectrons. It is suggested that a similar two-step process also contributes to the population of excited Xe2+ states and is the main origin for the production of threshold electrons in decay of the 4d−1 np resonances. |
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