Observation of the secondΠu3valence state ofO2
| Autor: | K. Waring, Kenneth Baldwin, Stephen Gibson, P. M. Dooley, Harry Partridge, Brenton Lewis, J. P. England |
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| Rok vydání: | 1996 |
| Předmět: | |
| Zdroj: | Physical Review A. 54:3923-3938 |
| ISSN: | 1094-1622 1050-2947 |
| DOI: | 10.1103/physreva.54.3923 |
| Popis: | Rotational perturbations in the B${\mathrm{}}^{3}$${\mathrm{\ensuremath{\Sigma}}}_{\mathit{u}}^{\mathrm{\ensuremath{-}}}$ state of molecular oxygen are studied by measuring high-resolution vacuum ultraviolet laser photoabsorption cross sections of the (16,0)--(18,0) B${\mathrm{}}^{3}$${\mathrm{\ensuremath{\Sigma}}}_{\mathit{u}}^{\mathrm{\ensuremath{-}}}$\ensuremath{\leftarrow}X${\mathrm{}}^{3}$${\mathrm{\ensuremath{\Sigma}}}_{\mathit{g}}^{\mathrm{\ensuremath{-}}}$ Schumann-Runge bands of $^{16}\mathrm{O}_{2}$. The observation of numerous extra lines in the spectrum, together with ab initio calculations of relevant potential-energy curves, enables the perturbing state to be assigned as the second valence state of $^{3}\mathrm{\ensuremath{\Pi}}_{\mathit{u}}$ symmetry. This weakly bound state, which we name ${\mathit{C}}^{\ensuremath{'}3}$${\mathrm{\ensuremath{\Pi}}}_{\mathit{u}}$, is also likely to be principally responsible for the well-known rapid increase in the magnitudes of the B-state triplet-splitting constants ${\ensuremath{\lambda}}_{\mathit{v}}$ and ${\ensuremath{\gamma}}_{\mathit{v}}$ as the dissociation limit is approached. \textcopyright{} 1996 The American Physical Society. |
| Databáze: | OpenAIRE |
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