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On the spin and hyperfine splittings in the X(2)Sigma(+) ground states of AlO and AlS
KTH, School of Engineering Sciences (SCI), Applied Physics.
2012 (English)In: Journal of Molecular Spectroscopy, ISSN 0022-2852, E-ISSN 1096-083X, Vol. 271, no 1, 56-58 p.Article in journal (Refereed) Published
Abstract [en]

A re-analysis of the A'(2)Pi(i)-X(2)Sigma(+) band system of the AlS radical has been performed. The previously published material has been refined and extended to approximately 36,000 line assignments. The line material has been fitted to a(2)Sigma(+) hyperfine Hamiltonian, in the same manner as in the recently published work on the B(2)Sigma(+)-X(2)Sigma(+) and A(2)Pi(i)-X(2)Sigma(+) systems of AlO. The present analysis shows the same trends for the ground state gamma-values as in AlO, i.e. decreasing gamma-values upon increasing v. It has been confirmed that the spin splittings of the X(2)Sigma(+) (v=0) levels in both molecules are mainly due to nuclear hyperfine interaction and second order spin-orbit effects due to the high-lying regular (2)Pi state (C(2)Pi in AlO and B(2)Pi in AlS), while the influence of the low-lying inverted (2)Pi state on gamma increases dramatically with increasing v, resulting in negative gamma-values starting from v=2.

Place, publisher, year, edition, pages
2012. Vol. 271, no 1, 56-58 p.
Keyword [en]
High resolution, Fourier transform, AlO, AlS, Emission spectra, Nuclear hyperfine structure, Spin splitting
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-91141DOI: 10.1016/j.jms.2011.12.001ISI: 000299462000010ScopusID: 2-s2.0-84855976259OAI: diva2:508490
QC 20120308Available from: 2012-03-08 Created: 2012-03-08 Last updated: 2012-03-08Bibliographically approved

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Launila, Olli
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