Rare Earth Nitrate Hybrid Double Perovskites [MeN][MLn(NO)] (M = Na-Cs; Ln = La-Gd, ex. Pm).

An exploration of the synthetic and structural phase space of rare earth hybrid double perovskites AB'BX (A = organocation, B' = M, B = M, X = molecular bridging anion) that include X = NO and B' = alkali metal is reported, complementing earlier studies of the [MeN][KB(NO)] (B = Am, Cm, La-Nd, Sm-Lu, Y) (MeN = (CH)N) compounds. In the present efforts, the synthetic phase space of these systems is explored by varying the identity of the alkali metal ion at the B'-site. Herein, we report three new series of the form [MeN][B'B(NO)] (B = La-Nd, Sm-Gd; B' = Na, Rb, Cs).

Electronic Spectroscopy and Photoionization of LiBe.

LiBe has been the subject of several theoretical investigations and one spectroscopic study. Initially, these efforts were motivated by interest in the intermetallic bond. More recent work has explored the potential for producing LiBe and LiBe at ultracold temperatures.

Electronic Spectroscopy and Photoionization of LiMg.

Dimers consisting of an alkali metal bound to an alkaline earth metal are of interest from the perspectives of their bonding characteristics and their potential for being laser cooled to ultracold temperatures. There have been experimental and theoretical studies of many of these species, but spectroscopic data for LiMg and the LiMg cation are sparse. In this study, rotationally resolved electronic spectra for LiMg are presented.

Spectroscopy and electronic structure of the hypermetallic oxide, MgOMg.

Electronic spectra for the hypermetallic oxide MgOMg have been observed in the 21 100 cm-24 000 cm spectral range using laser induced fluorescence and two-photon resonantly enhanced ionization techniques. Rotationally resolved data confirmed the prediction of a X̃Σ ground state. The spectrum was highly congested due to the optical activity of a low-frequency bending mode and the presence of three isotopologues with significant natural abundances.

Low energy states of NdO probed by photoelectron spectroscopy.

The ionization energy (IE) of NdO and the low-energy electronic states of NdO have been examined by means of two-color photoionization spectroscopy. The value obtained for the IE, 5.5083(2) eV, is 0.

Bond dissociation energies of TiSi, ZrSi, HfSi, VSi, NbSi, and TaSi.

Predissociation thresholds have been observed in the resonant two-photon ionization spectra of TiSi, ZrSi, HfSi, VSi, NbSi, and TaSi. It is argued that because of the high density of electronic states at the ground separated atom limit in these molecules, the predissociation threshold in each case corresponds to the thermochemical bond dissociation energy. The resulting bond dissociation energies are D(TiSi) = 2.

Bond dissociation energies of diatomic transition metal selenides: TiSe, ZrSe, HfSe, VSe, NbSe, and TaSe.

Predissociation thresholds have been observed in the resonant two-photon ionization spectra of TiSe, ZrSe, HfSe, VSe, NbSe, and TaSe. It is argued that the sharp onset of predissociation corresponds to the bond dissociation energy in each of these molecules due to their high density of states as the ground separated atom limit is approached. The bond dissociation energies obtained are D(TiSe) = 3.