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Laser‐induced Fluorescence of Ba + Ions Trapped and Mass‐selected in a Fourier Transform Ion Cyclotron Resonance Mass Spectrometer
Author(s) -
Zhong Li Guo,
Vining Bryan A.,
Guan Shenheng,
Marshall Alan G.
Publication year - 1996
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/(sici)1097-0231(199611)10:14<1850::aid-rcm760>3.0.co;2-1
Subject(s) - chemistry , fourier transform ion cyclotron resonance , ion , ion cyclotron resonance , reflectron , mass spectrometry , atomic physics , laser , ion trap , ion source , analytical chemistry (journal) , ionization , time of flight mass spectrometry , optics , physics , cyclotron , organic chemistry , chromatography
We present the design and preliminary results from a Fourier transform ion cyclotron resonance (ICR) mass spectrometer developed for the direct detection of UV/visible laser‐induced fluorescence of trapped, mass‐selected, 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 ion/neutral 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 ion/molecule reactions.