Radiative association in Li+H revisited: the role of quasi-bound states |
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| Authors: | O J Bennett A S Dickinson T Leininger F X Gadéa |
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| Institution: | School of Natural Sciences (Physics), The University of Newcastle upon Tyne, Newcastle upon Tyne NE1 7RU;Laboratoire de Physique Quantique, UMR 5626 du CNRS, UniversitéPaul Sabatier, 118 Route de Narbonne, F-31062 Toulouse Cedex 04, France |
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| Abstract: | The role in radiative association of narrow resonances arising from quasi-bound levels is examined. For the rate coefficient the contribution from such levels is readily calculated in terms of the Einstein A -coefficient from bound rovibrational levels generated using a suitable alternative boundary condition. By locating systematically all the quasi-bound levels, an enhancement by more than an order of magnitude of the rate coefficient for Li(2s) + H(1s) association above about 600 K is obtained. The effect on the LiH abundance in the early Universe is no more than an increase of a factor of 3 for limited ranges of values of the redshift. For the Li(2p) state the effect of narrow resonances appears to have been taken into account in previous calculations. |
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| Keywords: | atomic data atomic processes early Universe |
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