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This paper presents pulsed-field ionization, zero electron kinetic energy (ZEKE) photoelectron and threshold photoionization spectra of M-X[(C[H.sub.3]).sub.3] (M = Ga, In; X = P, As). The ZEKE spectra exhibit well-resolved vibrational structures. A comparison with B3LYP calculations shows that the spectrum of In-P[(C[H.sub.3]).sub.3] arises from the [sup.1][A.sub.1] [left arrow] [sup.2]E transition and the spectra of Ga-P[(C[H.sub.3]).sub.3] and Ga-As[(C[H.sub.3]).sub.3] arise from transitions of a Jahn-Teller distorted doublet state to the [sup.1][A.sub.1] state. The intensifies of the [sup.1][A.sub.1]-[sup.2]E transition in the indium species are described with the Franck-Condon approximation, while the transitions in the gallium complexes are more complicated due to the dynamic Jahn-Teller effect. The adiabatic ionization potentials of Ga-P[(C[H.sub.3]).sub.3], In-P[(C[H.sub.3]).sub.3], and Ga-As[(C[H.sub.3]).sub.3] are 39 635, 38 930, and 40 322 [cm.sup.-1] respectively, and the ionization threshold of In-As[(C[H.sub.3]).sub.3] is -39 550 [cm.sup.-1]. The metal-ligand stretching frequencies are 143, 116, and 125 [cm.sup.-1] for [Ga.sup.+]-P, [In.sup.+]-P. and [Ga.sup.+]-As, respectively, and 96 [cm.sup.-1] for In-P. The intermolecular bending frequencies are 71, 65, and 42 [cm.sup.-1] for [Ga.sup.+]-P-C, [In.sup.+]-P-C. and [Ga.sup.+]-As-C, respectively, and 47 [cm.sup.-1] for In-P-C. In addition, ligand-based vibrational frequencies are determined for the C[H.sub.3] wag, P[C.sub.3] and As[C.sub.3] umbrella, and P-C stretching vibrations. Key words: ZEKE photoelectron, photoionization, DFT. gallium-phosphine, gallium-arsine, indium-phosphine, indium-arsine.

In NH3 is examined with single-photon zero electron kinetic energy (ZEKE) spectroscopy and density functional theory and ab initio calculations. The conclusion states that the stronger metal--ligand bonding in the ion state is due to the additional charge--dipole and covalent interactions.

Four states that are derived from the 3d(sub Ni)(super 9), 3d(sub Cu)(super 10)sigma(super 2) manifold are observed by a dispersed fluorescence investigation of the low-lying electronic states of NiCu. The results are based on selection rules and comparison to ab initio and ligand field calculations, and modeled using a matrix Hamiltonian and is applied to spectroscopic molecules of AlNi, NiH, NiCl and NiF.

The group 13 metal atoms with the group 15 hydrides are prepared with laser-ablation molecular beam techniques and studied with ab initio calculations, threshold photoionization and zero electron kinetic energy photoelectron spectroscopies. The binding between the metal and ligand is enhanced nearly three to five times through this ionization.