Abstract
Detailed measurements have been made of the H, OH and H2CO lines formed in the L1534 dense dust cloud; some H and H2CO observations have been made of the dust cloud lying behind the Orion cluster. These indicate a similar distribution of the 3 species throughout the dust clouds. Studies of H, OH and H2CO absorption features in clouds lying in front of bright radio sources provide estimates of the physical conditions in regions of molecule formation.
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