An atmospheric absorption system of molecular oxygen and water has bee
n detected and identified in apatites. Such a phenomenon is firstly de
scribed in solids. Our results confirm that molecular oxygen and water
may be accommodated by structural incorporation in the channels of th
e apatite structure. A reabsorption spectrum represents a new spectros
copic tool which gives direct evidence of such existence. (C) 1997 Els
evier Science B.V.