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Spectroscopy of AlO: Combined analysis of the A(2)Pi(i) -> X-2 Sigma(+) and B-2 Sigma(+) -> X-2 Sigma(+) transitions
KTH, School of Engineering Sciences (SCI), Applied Physics.
KTH, School of Engineering Sciences (SCI), Applied Physics.
2011 (English)In: Journal of Molecular Spectroscopy, ISSN 0022-2852, E-ISSN 1096-083X, Vol. 265, no 1, 10-14 p.Article in journal (Refereed) Published
Abstract [en]

A combined analysis of the A(2)Pi(i) -> X-2 Sigma(+) and B-2 Sigma(+) -> X-2 Sigma(+) band systems of AlO, involving 21,500 line assignments, has been performed. The analysis indicates that the previously reported gamma values of the B-2 Sigma(+) state are questionable. The present analysis shows that gamma(B-2 Sigma(+))approximate to 0.014 cm(-1), essentially independent of the vibrational level. The positive sign is consistent with second order interaction with the higher-lying C-2 Pi(r) and lower-lying A(2)Pi(i) states. It also appears that many of the previously reported gamma and gamma(D) values of X-2 Sigma(+) (v > 0) are doubtful. In fact, gamma(X-2 Sigma(+)) is observed to become increasingly negative for v '' > 1, due to second order interaction with the low-lying A(2)Pi(i) state. The present results are based on models where the hyperfine structure of the (2)Sigma(+) states has been taken into account explicitly. Intensity patterns of the branches of the B-2 Sigma(+) -> X-2 Sigma(+) system have been shown to be influenced by the case b beta(s) coupling in the ground state v = 0,1 levels. This gives rise to intensity differences of around 10 percent in the R-1/R-2 and P-1/P-2 doublet components. The synthesized intensity patterns are fully in accord with the F-1/F-2 assignments of the present work.

Place, publisher, year, edition, pages
2011. Vol. 265, no 1, 10-14 p.
Keyword [en]
High resolution, Fourier transform, AlO, Emission spectra, Nuclear hyperfine structure, Spin splitting
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-30528DOI: 10.1016/j.jms.2010.10.005ISI: 000286546000002Scopus ID: 2-s2.0-78650856861OAI: oai:DiVA.org:kth-30528DiVA: diva2:401828
Note

QC 20110304

Available from: 2011-03-04 Created: 2011-02-28 Last updated: 2017-12-11Bibliographically approved

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