Modification of a double focusing mass spectrometer for angular resolution

A m a s spectrometric method of distinguishing between molecular ions of the three isomeric xylenes (dimethylbenzenes) was sought, in light of recent findings that photoexcited ions could be distinguished via measurements of kinetic energy release accompanying expulsion of a methyl radical. Provided the molecular ions are formed with low internal energies, reproducible differences were found between relative intensities of collision induced reactions of higher critical energies than for methyl expulsion. These ditterences exist both for collision energies in the kilovolt range (double focusing mass spectrometers) and in the range of a few tens of volts (triple quadruple instrument). Though statistically significant, these Werences were small.The mechanism of isomerization and fragmentation was investigated via isotopic labelling studies and measurements of kinetic energy release. Most of the present findings can be rationalized in terms of the most recent version of established mechanisms for reactions of ionized methylbenzenes.

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Angle-resolved mass spectrometry

Laramee

Carmody

Cooks

1979

International Journal of Mass Spectrometry and Ion Physics

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Modification of a double focusing mass spectrometer for angular resolution

Cited by 15 publications

References 4 publications

Gas‐phase chemistry of collisionally activated ions

Gas‐phase chemistry of collisionally activated ions

Experimental investigation of the molecular ions of the xylenes

Angle-resolved mass spectrometry

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