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Laser-induced Fluorescence of Ba+ Ions Trapped and Mass-selected in a Fourier Transform Ion Cyclotron Resonance Mass Spectrometer

✍ Scribed by Guo Zhong Li; Bryan A. Vining; Shenheng Guan; Alan G. Marshall

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
528 KB
Volume
10
Category
Article
ISSN
0951-4198

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✦ Synopsis

We present the design and preliminary results from a Fourier transform ion cyclotron resonance (ICR) mass spectrometer developed for the direct detection of W/visible laser-induced fluorescence of trapped, massselected, gas-phase ions. A 3 T superconducting magnet and an open-ended multi-section cylindrical Penning trap capture and confine ions created by electron impact or laser desorption. Azimuthal quadrupolar excitation in the presence of iodneutral collisions cools, axializes and mass selects ions as they fill the trap. A pulsed dye laser pumped by an Nd : YAG laser provides electronic energy excitation. A Brewster window and baffles on each side of the vacuum chamber reduce the scattered light from the excitation laser. Laser-induced fluorescence is collected from mirrors and lenses and directed through a quartz window and fiber-optic bundle to a photomultiplier. The ICR and optical events are controlled by a modular ICR data station and GPIB and Rs-232 interfaces. An excitation spectrum is demonstrated for atomic Ba+ ions, and should extend to laser-induced fluorescence of virtually any stable positive or negative gas-phase ions of arbitrary molecular weight: molecular or quasimolecular ions, fragment ions, adduct ions, and ions formed from ionholeale reactions.

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