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Within a mass spectrometer operating near vacuum, which outcome reduces isotopic resolution?

A)Increased ion kinetic energy variance
B)Decreased magnetic field inhomogeneity
C)Minimized detector dead time effects
D)Optimized electron source filament current

💡 Explanation

Increased variance in kinetic energy among ions broadens their flight paths; therefore, isotopic resolution decreases because the arrival times overlap, rather than different isotopes being clearly separated during the ion separation mechanism.

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