THE UTILITY OF A BIASED ACTIVATION CELL FOR LASER-ION BEAM PHOTODISSOCIATION STUDIES
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The use of a biased activation cell for performing photodissociation experiments on a triple sector ion-beam mass spectrometer is described. The objective of this work is to eliminate or reduce background signals from metastable ion and/or residual collision-induced dissociation and thereby increase sensitivities for laser-ion beam photodissociation. Selected photodissociation reactions demonstrate the utility of the biased activation cell. Biasing the activation cell separates a significant fraction ( 85%) of the metastable background from the photodissociation signals, thereby increasing signal-to-noise ratios and shortening data collection times in the photodissociation experiment. In addition, the rates of photodissociating ions can be estimated. The photodissociation mass spectra of the geometric isomers trans,trans-2,4-hexadiene and cis,trans-2,4-hexadiene ions (C6H+10 are distinguishable. 1989.