Publication
Journal of Physical Chemistry
Paper

Resonance-enhanced two-laser infrared multiple photon dissociation of gaseous ions

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Abstract

Ions trapped in a Fourier transform ion cyclotron resonance (FTICR) mass spectrometer exhibited enhanced infrared multiple photon dissociation (IRMPD) when irradiated sequentially by two carbon dioxide lasers using a novel IRMPD probe/pump photodissociation scheme. A low-power pulsed (probe) laser tuned to a resonant infrared absorption band promoted trapped ions to vibrationally excited states, but often had insufficient energy to cause photodissociation. Subsequent irradiation of the excited ions with a fixed-frequency, nonresonant, continuous wave (pump) laser induced photofragmentation. Photodissociation spectra were obtained by varying the wavelength of the probe laser. A novel White-type cell which shows great promise for dramatically enhancing the effect of the probe laser has been designed and constructed for use with these experiments. © 1991 American Chemical Society.

Date

01 May 2002

Publication

Journal of Physical Chemistry

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