High-resolution L -shell Auger spectroscopy of Mg-like scandium produced in 89-MeV Sc sup 8+ +He collisions

• Published in: Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 1991-12, Vol.44:11
• Main Authors: Sataka, M., Kawatsura, K., Naramoto, H., Nakai, Y., Yamazaki, Y., Komaki, K., Kuroki, K., Kanai, Y., Kambara, T., Awaya, Y., Hansen, J.E., Kadar, I., Stolterfoht, N.
• Format: Article
• Language: English
• Subjects: 664100 - Theory of Electronic Structure of Atoms & Molecules- (1992-); 664300 - Atomic & Molecular Physics- Collision Phenomena- (1992-); ATOM COLLISIONS; ATOMIC AND MOLECULAR PHYSICS; ATOMIC IONS; AUGER ELECTRON SPECTROSCOPY; BRANCHING RATIO; CHARGED PARTICLES; COLLISIONS; CORRELATIONS; ELECTRON CORRELATION; ELECTRON EMISSION; ELECTRON SPECTROSCOPY; ELECTRONIC STRUCTURE; ELEMENTS; EMISSION; ENERGY LEVELS; ENERGY RANGE; FINE STRUCTURE; FLUIDS; GASES; HELIUM; ION COLLISIONS; ION-ATOM COLLISIONS; IONS; MEV RANGE; MEV RANGE 10-100; MULTICHARGED IONS; NONMETALS; QUANTUM NUMBERS; RARE GASES; SCANDIUM IONS; SPECTROSCOPY
• ISSN: 1050-2947; 1094-1622
• DOI: 10.1103/PhysRevA.44.7290

In 89-MeV Sc{sup 8+}+He collisions, the light target atom He was used to ionize selectively the 2{ital p} shell of the scandium projectile. The subsequent {ital L}-shell Auger emission from Mg-like Sc{sup 9+} was measured with high resolution using the method of zero-degree Auger spectroscopy. The spectra are dominated by three peak groups that are attributed to transitions from the various initial states belonging to the configuration 1{ital s}{sup 2}2{ital s}{sup 2}2{ital p}{sup 5}3{ital s}{sup 2}3{ital p} to the final states 1{ital s}{sup 2}2{ital s}{sup 2}2{ital p}{sup 6}3{ital s} {sup 2}{ital S}, 1{ital s}{sup 2}2{ital s}{sup 2}2{ital p}{sup 6}3{ital p} {sup 2}{ital P}, and 1{ital s}{sup 2}2{ital s}{sup 2}2{ital p}{sup 6}3{ital d} {sup 2}{ital D}. The {sup 2}{ital P}{sub 1/2-}{sup 2}{ital P}{sub 3/2} fine-structure splitting was resolved for the final configuration 1{ital s}{sup 2}2{ital s}{sup 2}2{ital p}{sup 6}3{ital p}. The branching ratio for the transition to 1{ital s}{sup 2}2{ital s}{sup 2}2{ital p}{sup 6}3{ital d} {sup 2}{ital D}, which involves three electrons and, thus, must be ascribed to correlation, is compared to earlier results for the isoelectronic ions Al{sup +} and Ar{sup 6+}. Good agreement between observed and calculated branching ratios to the three final states is obtained by including only correlation in the initial state. A discrepancy for the branching to the 1{ital s}{sup 2}2{ital s}{sup 2}2{ital p}{sup 6}3{ital d} {sup 2}{ital D} term, which was observed already in the earlier investigation of Ar{sup 6+}, has been removed by including correlation in the {ital n}=2 shell in addition to the correlation in the {ital n}=3 shell, which was the only correlation introduced previously.