A number of experimental techniques have been brought together to create a powerful investigative tool. This laser vaporisation, supersonic expansion, laser ionisation mass spectrometry amalgam has allowed the study of two distinct types of molecular species. Many heteronuclear diatomic species have been prepared and investigated for the first time. These novel molecules are of interest due to their utility as bulk phase alloys. Mass spectra are presented for many such combinations. Homonuclear diatomic species have been analysed using these techniques for some time. In particular, this work has focused on transition metal species as this is one of the few methods which permits such study. Spectroscopic investigations of the A, B and C states of the silver dimer (Ag₂) molecule are presented here. The analysis of this work has provided the following rotational constants for these states; X state B_e = 0.04878 cm^-1 A state B_e = 0.04432 cm^-1 B state B_e = 0.04544 cm^-1 and C state B₀ = 0.04851 cm^-1. All values are for the ^107,109Ag₂ isotopomer. The first ionisation potential (I.P.) of any molecular system is an important parameter in the understanding of that species. The value of the I.P. has been evaluated for the silver dimer molecule under differing experimental conditions. It is reported here both under the influence of a potential field (I.P. = 61658.4 cm^-1) and under field free conditions (I.P. = 61740.0 cm^-1).