Reactions of laser-ablated In atoms with pure hydrogen and pure deuterium give sharp absorptions for the InH and InD intermediate species. Ultraviolet irradiation produces InH2 and InD2 and maximizes the yield of the indane monomers InH3 and InD3, which are observed as the hypervalent complexes (H-2)InH3 and (D-2)InD3. In addition In+(H-2)(n) and In+(D-2)(n) cations and H-(H-2)(n) and D-(D-2)(n) anions are observed in these samples. Irradiation at 193 nm photoionizes In, increases the yields of both cation and ion, excites In to activate the endothermic reaction with H-2 to form InH, and promotes the conversion of InH to InH3. Annealing to 6-8 K provides evidence for In2H2, In2D2, In2H4, and In2D4 isomers, In2H6, and In2D6, and warming the samples to allow evaporation of the H-2 and D-2 matrix hosts replaces the sharp absorptions by broad 1460 and 1060 cm(-1) bands with dominant contributions from solid indane (InH3)(n) and (InD3)(n) respectively. Diindane is unstable on ultraviolet photolysis in contrast to digallane and dialane. Our solid indane sample decomposes at 180-190 K, which casts doubt on earlier reports for its preparation. Complementary neon matrix experiments give smaller yields of InH1-3 and larger yields of In2H2 and InH4- than solid hydrogen experiments.