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research article

Using Matrix Peaks to Map Topography: Increased Mass Resolution and Enhanced Sensitivity in Chemical Imaging

McDonnel, L. A.
•
Mize, T. H.
•
Luxembourg, S. L.
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2003
Analytical Chemistry

It is well known in secondary ion mass spectrometry (SIMS) that sample topography leads to decreased mass resolution. Specifically, the ion's time of flight is dependent on where it was generated. Here, using matrix-enhanced SIMS, it is demonstrated that, in addition to increasing the yield of intact pseudomolecular ions, the matrix allows the user to semiquantitatively record the topography of a sample. Through mapping the topography-related mass shifts of the matrix (which leads to decreased mass resolution), the analogous mass shifts of higher mass ions can be deconvoluted and higher resolution and greater sensitivity obtained. Furthermore, the semiquantitative topographical map obtained can be compared with any chemical images obtained, allowing the user to quickly ascertain whether local intensity maximums are due to topological features or represent genuine features of interest.

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Type
research article
DOI
10.1021/ac034401j
Author(s)
McDonnel, L. A.
•
Mize, T. H.
•
Luxembourg, S. L.
•
Koster, S.
•
Eijkel, G. B.
•
Verpoorte, E.
•
de Rooij, N. F.  
•
Heeren, R. M. A.
Date Issued

2003

Published in
Analytical Chemistry
Volume

75

Issue

17

Start page

4373

End page

4381

Note

312

Peer reviewed

REVIEWED

Written at

OTHER

EPFL units
SAMLAB  
Available on Infoscience
May 12, 2009
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/39597
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