Threshold Electron Impact Excitation of Atoms and Molecules: Detection of Triplet and Temporary Negative Ion States

1968 ◽  
Vol 48 (2) ◽  
pp. 901-909 ◽  
Author(s):  
R. N. Compton ◽  
R. H. Huebner ◽  
P. W. Reinhardt ◽  
L. G. Christophorou
Keyword(s):  
Electron Impact ◽  
Negative Ion ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Atoms And Molecules

scholarly journals Electron-Impact Excitation of the 5p55d6s2 Autoionizing States in Ba Atom

2020 ◽  
Vol 65 (1) ◽  
pp. 12
Author(s):  
V. Borovik ◽  
V. Hrytsko ◽  
I. Shafranyosh ◽  
O. Borovik
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Spin Exchange ◽  
Negative Ion ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Observation Angle ◽  
Radial Wave ◽  
Impact Energies ◽  
Autoionizing States

The excitation cross-sections for the 5p55d6s2 autoionizing states of Ba atoms are studied experimentally and theoretically in an electron-impact energy range from the excitation thresholds of the states up to 600 eV. Experimental data are obtained by determining the intensities of lines in the ejected-electron spectra measured at an observation angle of 54.7∘. The incident-electron and ejected-electron energy resolutions are 0.2 eV and 0.07 eV, respectively. The calculations are performed in the distorted wave approximation by using relativistic radial wave functions obtained in the standard Dirac–Fock–Slater method. For all the states, the experimental cross-sections reach their maxima at low impact energies revealing by that predominantly the spin-exchange character of the excitation of autoionizing states. The structure of the near-threshold maxima indicates the formation of strong negative-ion resonances. At high impact energies, the shape and value of the cross-sections are determined by configuration and state mixing effects.

Electron-Impact Excitation and Negative-Ion Formation in NH3and ND3

1969 ◽  
Vol 180 (1) ◽  
pp. 111-120 ◽  
Author(s):  
R. N. Compton ◽  
J. A. Stockdale ◽  
P. W. Reinhardt
Keyword(s):  
Electron Impact ◽  
Negative Ion ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Ion Formation

Electron-Impact Excitation of 3s3p6nl States of Ar

1971 ◽  
Vol 49 (24) ◽  
pp. 3095-3098 ◽  
Author(s):  
E. Bolduc ◽  
J. J. Quéméner ◽  
P. Marmet
Keyword(s):  
Electron Impact ◽  
Cross Section ◽  
Excitation Cross Section ◽  
Negative Ion ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
First Time

Clearly resolved structures are reported for the first time in the ionization curve of Ar between 24 and 29.5 eV. We have found the energy and the shape of the excitation cross section for several states. The negative-ion state Ar− (3s3p64s2) has also been detected.

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