| A laser ablation source has been constructed for a pulsed jet cavity Fourier transform microwave (FTMW) spectrometer. This source is mounted in one of the microwave cavity mirrors and includes a mechanism for rotating and translating the target metal rod. Seven metal-containing species, namely MgS, MgBr, AlBr, MgNC, AlNC, YF and YBr, have been prepared using this apparatus and their pure rotational spectra have been measured by FTMW spectroscopy.;The first laser ablation-FTMW measurement of a metal sulfide, MgS, has been made. The ;The pure rotational spectra of magnesium monobromide and aluminium monobromide have been measured between 9.3 and 20.1 GHz. For MgBr, this is the first report of such a spectrum. Rotational, fine structure and several Br hyperfine parameters have been obtained for this radical and an accurate equilibrium bond length has been determined. From the nuclear quadrupole and magnetic hyperfine constants MgBr has been found to be highly ionic, with the unpaired electron residing almost entirely on Mg. For AlBr, accurate hyperfine parameters have been obtained, including the first values for the Al;Pure rotational spectra of aluminium isocyanide and magnesium isocyanide have been measured in the frequency range 11.9-23.9 GHz. The hyperfine structure in MgNC caused by the ;The first high resolution spectrum of yttrium monobromide has been measured between 7.4 and 22.5 GHz. In addition, nuclear spin-rotation splitting has been observed in the spectrum of yttrium monofluoride. Equilibrium rotational parameters have been determined for YBr and used to calculate an equilibrium bond distance. Hyperfine structure due to the bromine nuclei has been observed and nuclear quadrupole and nuclear spin-rotation constants have been determined. From them, YBr has been found to be highly ionic and very similar in behaviour to the alkali metal bromide species. The FTMW results for YF have been combined with data from other pure rotational studies to determine the nuclear spin rotation constant. |
