LASER-INDUCED FLUORESCENCE OF BA-SELECTED IN A FOURIER-TRANSFORM ION-CYCLOTRON RESONANCE MASS-SPECTROMETER( IONS TRAPPED AND MASS)

We present the design and preliminary results from a Fourier transform ion cyclotron resonance (ICR) mass spectrometer developed for the dir ect detection of UV/visible laser-induced fluorescence of trapped, mas s-selected, gas-phase ions, A 3T superconducting magnet and an open-en ded multi-section cylindrical Penning trap capture and confine ions cr eated by electron impact or laser desorption, Azimuthal quadrupolar ex citation in the presence of ion/neutral collisions cools, axializes an d mass selects ions as they fill the trap, A pulsed dye laser pumped b y an Nd:YAG laser provides electronic energy excitation, A Brewster wi ndow acid baffles on each side of the vacuum chamber reduce the scatte red light from the excitation laser, Laser-induced fluorescence is col lected from mirrors and tenses and directed through a quartz window an d fiber-optic bundle to a photomultiplier, The ICR and optical events are controlled by a modular ICR data station and GPIB and RS-232 inter faces, An excitation spectrum is demonstrated for atomic Ba+ ions, and should extend to laser-induced fluorescence of virtually any stable p ositive or negative gas-phase ions of arbitrary molecular weight: mole cular or quasimolecular ions, fragment ions, adduct ions, and ions for med from ion/molecule reactions.