CAVITY RINGDOWN SPECTROSCOPY ON THE $b {^{1}}\Sigma^{+}_{g} - X^{3}\Sigma^{-}_{g}(v^{\prime}, 0)$ BANDS $(v^{\prime}=0.3)$ OF $O_{2}$-ISOTOPOMERS
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Date
1999
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Ohio State University
Abstract
Cavity RingDown Spectroscopy (CRDS) has been used to investigate the $b {^{1}}\Sigma^{+}_{g} - X^{3}\Sigma^{-}_{g}$ system of oxygen isotopomers. The absorption bands of this system are very weak due to the strongly forbidden character of gerade-gerade and $\Sigma^{+} - \Sigma^{-}$ transitions, and they can only be observed via a magnetic dipole transition moment. The four allowed branches are a factor of $10^{9}$ weaker than typical electric dipole allowed transitions. The high sensitivity $(10^{-9} cm^{-1})$, obtained even in a short cell $(< 1 m)$, makes CRDS ideal for spectroscopy on isotopically enriched samples. Our studies yield updated or new values for the molecular constants of the $b {^{1}}\Sigma^{+}_{g} - X^{3}\Sigma^{-}_{g}(v^{\prime}, 0)$ bands for $v^{\prime} =0.3$ of oxygen isotopomers. These values may help to identify emission bands from excited vibrational levels of $O_{2} (b^{1}\Sigma^{+}_{g})$, including minority isotopomers, as observed in the Earth's $atmosphere^{a}$ and can aid in the interpretation of weak signals in the search for possible violation of the symmetrization postulate in $^{16}O_{2}^{\delta c}$.
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$^{a}$ T.G. Slanger, D.L. Huestis, D.E. Osterbrock and J.P. Fullbright Science 277, 1485, 1997. $^{b}$ M. de Angelis, G. Gagliardi, L. Gianfrani and G.M. Tino Phys. Rev. Lett. 76, 2840, 1996. $^{c}$ R.C. Hilborn and C.L. Yuca Phys. Rev. Lett. 76, 2844, 1996.
Author Institution: Vrije Universiteit, Department of Physics and Astronomy
Author Institution: Vrije Universiteit, Department of Physics and Astronomy