@article {2783,
	title = {Axial CID and high pressure resonance CID in a miniature ion trap mass spectrometer using a discontinuous atmospheric pressure interface.},
	journal = {Journal of the American Society for Mass Spectrometry},
	volume = {21},
	year = {2010},
	month = {2010 Feb},
	pages = {209-14},
	abstract = {<p>Axial collision induced dissociation (CID) and high-pressure resonance CID were implemented and compared with normal low-pressure resonance CID in a miniature ion trap mass spectrometer to obtain more complete fragmentation spectra. Axial CID was realized simply by applying a potential to the discontinuous atmospheric pressure interface (DAPI) capillary without performing parent ion isolation before dissociation. High-pressure resonance CID employed a double-introduction pulse scan function, by means of which precursor ions isolated at low-pressure (\&lt;10(-3) torr) were dissociated at high-pressure (0.1 torr-1 torr) with higher excitation energy, so that tandem MS of isolated precursor ions was achieved and extensive fragmentation was obtained. A simple peptide (Leu-enkephalin) and dye molecule (rhodamine B) ionized by ESI were used to investigate both methods and compare them with normal low-pressure resonance CID.</p>
},
	issn = {1879-1123},
	doi = {10.1364/AO.50.001792},
	author = {Gao, Liang and Li, Guangtao and Cooks, R Graham}
}
@article {2796,
	title = {In situ SIMS analysis and reactions of surfaces prepared by soft landing of mass-selected cations and anions using an ion trap mass spectrometer.},
	journal = {Journal of the American Society for Mass Spectrometry},
	volume = {20},
	year = {2009},
	month = {2009 Jun},
	pages = {949-56},
	abstract = {<p>Mass-selected polyatomic cations and anions, produced by electrosonic spray ionization (ESSI), were deposited onto polycrystalline Au or fluorinated self-assembled monolayer (FSAM) surfaces by soft landing (SL), using a rectilinear ion trap (RIT) mass spectrometer. Protonated and deprotonated molecules, as well as intact cations and anions generated from such molecules as peptides, inorganic catalysts, and fluorescent dyes, were soft-landed onto the surfaces. Analysis of the modified surfaces was performed in situ by Cs(+) secondary ion mass spectrometry (SIMS) using the same RIT mass analyzer to characterize the sputtered ions as that used to mass select the primary ions for SL. Soft-landing times as short as 30 s provided surfaces that yielded good quality SIMS spectra. Chemical reactions of the surfaces modified by SL were generated in an attached reaction chamber into which the surface was transferred under vacuum. For example, a surface on which protonated triethanolamine had been soft landed was silylated using vapor-phase chlorotrimethylsilane before being returned still under vacuum to the preparation chamber where SIMS analysis revealed the silyloxy functionalization. SL and vapor-phase reactions are complementary methods of surface modification and in situ surface analysis by SIMS is a simple way to characterize the products produced by either technique.</p>
},
	issn = {1879-1123},
	doi = {10.1364/AO.50.001792},
	author = {Nie, Zongxiu and Li, Guangtao and Goodwin, Michael P and Gao, Liang and Cyriac, Jobin and Cooks, R Graham}
}
