Molecules in the early universe

摘要: We present calculations of the formation astrophysically interesting molecules (H/sub 2/, HD, LiH, and HeH/sup +/) by gas-phase reactions during postrecombination epoch (redshifts z = 300-30). In standard Friedmann cosmological models, H/sub 2//Hroughly-equal10/sup -6/, HD/H/sub 2/roughly-equal10/sup -4.5/, LiH/H/sub -6.5/. These may dominate cooling trigger collapse primordial gas clouds. The dipole rotational transitions HD LiH are particularly important at high density low temperature. Additional form spherical these clouds, their keeps temperature between 400 1500 K over 12 decades increase until 2/ lines become optically thick. existence molecular coolants redshift has significant implications for first generation stars thermal instabilities in intergalactic matter.