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• W1967694593 abstract "The decay amplitude envelope of an ICR time-domain signal determines its corresponding Fourier transform mass spectral line shape. The commonly accepted FT-ICR frequency-domain unapodized Lorentzian spectral line shape originates from the Langevin ion-neutral collision model, in which an ion is treated as a point charge that induces an electric dipole moment in a neutral collision partner. The Langevin model provides a good description of reactions of low-energy collisions of low-mass positive ions with neutrals. However, the Langevin model is inappropriate for collisions of high-mass gas-phase biopolymer ions with low-mass neutrals. Here, we examine ion trajectories for both Langevin and hard-sphere ion-neutral collision models. For the Langevin model, collision frequency is independent of ion speed, leading to a linear differential equation of ion motion with a frictional damping term linearly proportional to ion velocity. For the hard-sphere model, collision frequency is proportional to ion speed and the frictional damping term is proportional to the square of ion velocity. We show that the resulting (non-linear) equation of ion motion leads to a non-exponential time-domain ICR signal whose amplitude envelope has the form, 1(1 + σt), in which σ is a constant. Dispersion-vs-absorption (DISPA) line shape analysis reveals that the ‘hard-sphere’ spectral line shape resembles that of overlaid narrow and broad Lorentzians. We discuss several important implications of the new ‘hard-sphere’ line shape for ICR spectral analysis, ICR signal processing, collision-based ion activation, and ion axialization. Finally, in the hard-sphere limit, a non-linear frictional damping term will also apply to ions in a Paul trap." @default.
• W1967694593 created "2016-06-24" @default.
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• W1967694593 date "1997-11-01" @default.
• W1967694593 modified "2023-10-18" @default.
• W1967694593 title "Effect of ion-neutral collision mechanism on the trapped-ion equation of motion: a new mass spectral line shape for high-mass trapped ions" @default.
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• W1967694593 doi "https://doi.org/10.1016/s0168-1176(97)00074-8" @default.
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