Abstract
The enhancement of the rate coefficient for the radiative association of Li and H to form LiH arising from stimulated emission by the cosmic background radiation field is calculated. It is shown that the effect on the fractional abundance of LiH in the early universe for redshifts z between 1000 and 10 is small.
Highlights
It has been suggested that the molecule LiH may be formed in the postrecombination epoch of the early universe in sufficient abundance to be detectable through its imprint on the cosmic background radiation
In reaction (1), the formaand the stimulated cross section is related to the spontaneous cross section by tion of LiH is stabilized by the spontaneous emission of a photon of frequency l as the Li and H approach and recede
Gested that the radiative association of Li and H may be signiÐcantly enhanced by stimulated emission because of Multiplying equations (5) and (6) results in the cosmic background radiation with frequency lb, Li ] H ] lb ] LiH ] l ] lb
Summary
It has been suggested that the molecule LiH may be formed in the postrecombination epoch of the early universe in sufficient abundance to be detectable through its imprint on the cosmic background radiation (de Bernardis et al 1993 ; Maoli, Melchiorri, & Tosti 1994 ; Signore et al 1994). The most recent studies concluded that because of the low rate coefficient for the radiative association of lithium and hydrogen, Li ] H ] LiH ] l , (1) In reaction (1), the formaand the stimulated cross section is related to the spontaneous cross section by tion of LiH is stabilized by the spontaneous emission of a photon of frequency l as the Li and H approach and recede.
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