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- W2018573973 abstract "A new ion soft landing instrument has been built for the controlled deposition of mass selected polyatomic ions. The instrument has been operated with an electrospray ionization source; its major components are an electrodynamic ion funnel to reduce ion loss, a 90-degree bent square quadrupole that prevents deposition of fast neutral molecules onto the landing surface, and a novel rectilinear ion trap (RIT) mass analyzer. The ion trap is elongated (inner dimensions: 8 mm × 10 mm × 10 cm). Three methods of mass analysis have been implemented. (i) A conventional mass-selective instability scan with radial resonance ejection can provide a complete mass spectrum. (ii) The RIT can also be operated as a continuous rf/dc mass filter for isolation and subsequent soft landing of ions of the desired m/z value. (iii) The 90-degree bent square quadrupole can also be used as a continuous rf/dc mass filter. The mass resolution (50% definition) of the RIT in the trapping mode (radial ion ejection) is ∼550. Ions from various test mixtures have been mass selected and collected on fluorinated self-assembled monolayers on gold substrates, as verified by analysis of the surface rinses. Desorption electrospray ionization (DESI) has been used to confirm intact deposition of [Val5]-Angiotensin I on a surface. Nonmass selective currents up to 1.1 nA and mass-selected currents of up to 500 pA have been collected at the landing surface using continuous rf/dc filtering with the RIT. A quantitative analysis of rinsed surfaces showed that the overall solution-to-solution soft landing yields are between 0.2 and 0.4%. Similar experiments were performed with rf/dc isolation of both arginine and lysine from a mixture using the bent square quadrupole in the rf/dc mode. The unconventional continuous mass selection methods maximize soft landing yields, while still allowing the simple acquisition of full mass spectra." @default.
- W2018573973 created "2016-06-24" @default.
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- W2018573973 date "2008-08-07" @default.
- W2018573973 modified "2023-09-26" @default.
- W2018573973 title "Ion Soft Landing Using a Rectilinear Ion Trap Mass Spectrometer" @default.
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- W2018573973 doi "https://doi.org/10.1021/ac800929w" @default.
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