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The structure of the vapour produced upon heating the dimethylalkoxygallane [Me2GaOCH2CH2NMe2]2has been studied by gas-phase electron diffraction and ab initiomolecular orbital calculations; only the monomeric form [Me2GaOCH2CH2NMe2] is observed in the vapour, with the nitrogen atom forming a dative bond with the metal centre. [ABSTRACT FROM AUTHOR]

A novel compact electron gun for use in time-resolved gas electron diffraction experiments has recently been designed and commissioned. In this paper we present and discuss the extensive simulations that were performed to underpin the design in terms of the spatial and temporal qualities of the pulsed electron beam created by the ionisation of a gold photocathode using a femtosecond laser. The response of the electron pulses to a solenoid lens used to focus the electron beam has also been studied. The simulated results show that focussing the electron beam affects the overall spatial and temporal resolution of the experiment in a variety of ways, and that factors that improve the resolution of one parameter can often have a negative effect on the other. A balance must, therefore, be achieved between spatial and temporal resolution. The optimal experimental time resolution for the apparatus is predicted to be 416 fs for studies of gas-phase species, while the predicted spatial resolution of better than 2 nm−1 compares well with traditional time-averaged electron diffraction set-ups. [ABSTRACT FROM AUTHOR]