Radiative association in Li+H revisited: the role of quasi-bound states

Details Radiative association in Li+H revisited: the role of quasi-bound states Radiative association in Li+H revisited: the role of quasi-bound states

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003mnras.341..361b&link_type=abstract

Monthly Notice of the Royal Astronomical Society, Volume 341, Issue 1, pp. 361-368.

Astronomy and Astrophysics

Astronomy

13

Atomic Data, Atomic Processes, Early Universe

Scientific paper

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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