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Dissociation of a molecule occurs through its excitation to a certain bound state that is coupled to a dissociative continuum. Predissociation is caused by interaction between discrete levels of a given electronic state and the dissociative continuum of another electronic state.
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19
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4544330498
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2O are ∼90 K in a molecular cloud and ∼150 K in the solar nebula, whereas those of CO are ∼16 K in a molecular cloud and ∼25 K in the solar nebula (38).
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23
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4544387996
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v are the intensities of visual tight from a background star before and after the transverse of the cloud.
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2O enrichments in the inner disk would be expected before the appearance of kilometer-size bodies in the outer disk
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35
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4544337899
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2O formation. A more detailed study coupled with disk dynamics is needed to evaluate the contribution of their CO dissociation at high altitudes attitudes in the disk to oxygen isotopic heterogeneity observed in the solar system.
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36
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4544345747
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note
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The bulk differences in oxygen isotopic composition observed among the meteorite groups and planets (1) could be explained by accretion at different times or by the incorporation of different amounts of nonvaporized water ice and solids with different degrees of the solid-gas equilibration. The solid-gas equilibration and the evolution of oxygen isotopic compositions of the gas in the inner region of the disk may have been recorded by refractory inclusions and chondrules in primitive meteorites.
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4544254153
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43
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4544234645
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note
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We thank T. J. Fagan, A. N. Krot, and E. R. D. Scott for helpful discussion and improvement of the English and two anonymous reviewers for helpful comments. Supported by Monbu-Kagaku-sho grants.
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