SIMS of Organic Materials-Interface Location in Argon Gas Cluster Depth Profiles Using Negative Secondary Ions.

Journal of the American Society for Mass Spectrometry
R HavelundI S Gilmore

Abstract

A procedure has been established to define the interface position in depth profiles accurately when using secondary ion mass spectrometry and the negative secondary ions. The interface position varies strongly with the extent of the matrix effect and so depends on the secondary ion measured. Intensity profiles have been measured at both fluorenylmethyloxycarbonyl-L-pentafluorophenylalanine (FMOC) to Irganox 1010 and Irganox 1010 to FMOC interfaces for many secondary ions. These profiles show separations of the two interfaces that vary over some 10 nm depending on the secondary ion selected. The shapes of these profiles are strongly governed by matrix effects, slightly weakened by a long wavelength roughening. The matrix effects are separately measured using homogeneous, known mixtures of these two materials. Removal of the matrix and roughening effects give consistent compositional profiles for all ions that are described by an integrated exponentially modified Gaussian (EMG) profile. Use of a simple integrated Gaussian may lead to significant errors. The average interface positions in the compositional profiles are determined to standard uncertainties of 0.19 and 0.14 nm, respectively, using the integrated EMG function. Altern...Continue Reading

References

Feb 8, 2008·The Journal of Physical Chemistry. B·Alexander G ShardIan S Gilmore
Apr 29, 2009·Rapid Communications in Mass Spectrometry : RCM·Satoshi NinomiyaJiro Matsuo
Aug 18, 2012·Analytical Chemistry·Alexander G ShardRudolf Moellers
Jul 24, 2013·Analytical Chemistry·Claudia BichAlain Brunelle
Jan 7, 2015·ACS Applied Materials & Interfaces·James BaileyDavid J Scurr
Jul 24, 2015·The Journal of Physical Chemistry. B·Alexander G ShardClaude Poleunis
Oct 1, 2015·The Journal of Physical Chemistry. B·M P SeahI S Gilmore
Apr 24, 2016·Journal of the American Society for Mass Spectrometry·Martin P SeahIan S Gilmore
Jul 23, 2016·Journal of the American Society for Mass Spectrometry·R J H MorrisG Rowlands

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Citations

Oct 26, 2018·Journal of the American Society for Mass Spectrometry·M P SeahI S Gilmore

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