| Autor: |
He, S. G., Tam, W. S., Leung, J. W-H., Cheung, A. S-C. |
| Předmět: |
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| Zdroj: |
Journal of Chemical Physics; 9/22/2002, Vol. 117 Issue 12, p5764, 6p, 1 Diagram, 3 Charts, 5 Graphs |
| Abstrakt: |
The (0,0) band of the B ²Σ[sup +]-X²Σ[sup +] transition of LaS near 726 nm has been studied at high resolution using laser vaporization/reaction supersonic free jet expansion and laser induced fluorescence spectroscopy. Spectra taken at a resolution of about 50 MHz show resolved hyperfine structure which is caused principally by the unpaired 6sσ- electron in the ground state interacting with large magnetic moment of the [sub 57][sup 139]La nucleus with nuclear spin I=7/2. The X²Σ[sup +] state of LaS is in good Hund's case (b[sub βs]) coupling, however, the upper state, B ²Σ[sup +], is close to case (b[sub βJ]) coupling. A total of 1850 rotational-hyperfine transition lines have been assigned and measured. Accurate rotational, spin and hyperfine parameters for the B ²Σ[sup +] and X²Σ[sup +] states have been obtained, which give information about the electron distribution in the molecule. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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