The emission spectra from a magnesium dc arc in hydrogen or deuterium have been photographed at high resolution from 600 to 850 nm. Thirteen new bands of MgH and 18 of MgD in the B′2Σ+–X2Σ+ system have been identified and complete rotational analyses have been performed. Term values have been obtained for all bound ground state rotational levels of MgH for ν = 4–9 and MgD for ν = 6–13 and limiting curves of dissociation have been used to determine the dissociation energy of MgH. The experimental value, D00″(MgH) = 1.27 ± 0.03 eV is in excellent agreement with theory. The ground state RKR potential curve and Franck–Condon factors for the B′–X system are reported. Data on the isotopic molecules 25MgH, 26MgH, 25MgD, and 26MgD have also been obtained.

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A band of jet-cooled 48Ti2 has been located in the near infrared by resonant two-photon ionization spectroscopy. Rotational analysis has shown the band to be an Ω′=0±←Ω″=1 transition, which is consistent with the 3Δg ground state proposed by Bauschlicher et al. [J. Chem. Phys. 95, 1057 (1991)]. The band is assigned as a 3Π0u ← X 3Δ1g transition, and lower and upper state bond lengths have been determined as r0(X 3Δg)=1.9422±0.0008 Å and r0(3Πu)=1.997±0.009 Å (1σ error limits, corrected for spin–uncoupling effects). Comparisons are made to the TiV and V2 molecules, a rationale for the unusual filling order of the 3d-based molecular orbitals is provided, and molecular orbital assignments are considered for the excited 3Πu state.

Silver(I) oxide was prepared in a controlled atmosphere by heating a pure, clean silver film in 02 and by reaction with 03. The infrared spectrum consists of one band at 535 cm-1 in the 400-4000-cm-1 region. From this Ag02 film, simple silver carbonate was formed by reaction with C02. It shows four bands at 1410, 1020, 880, and 690 cm-1. The further reaction with water vapor resulted in the formation of basic silver carbonate having peaks at 880, 705, 1060, 1380, and 1460 cm-1, and a broad weak band in the 3200-3400-cm-1 region. The stability of these species with respect to evacuation and heat treatment is also discussed.

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