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Optimisation of secondary ion transport in ambient pressure MeV SIMS

Matjacic, Lidija, Palitsin, Vladimir, Demarche, Julien, Rosa, Lucio, Stori, Elis M. and Webb, Roger (2019) Optimisation of secondary ion transport in ambient pressure MeV SIMS Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 448. pp. 1-4.

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Ambient Pressure MeV SIMS (AP MeV SIMS) is a special application of MeV SIMS technique for molecular detection and imaging under ambient conditions. There are several advantages of using ambient over nonambient techniques such as minimising or completely avoiding sample preparation that can contribute to the reducing of costs and shortening of analysis. Moreover, by performing analysis in ambient conditions negative vacuum influence on samples will be avoided. The emergence of ambient mass spectrometry techniques over the past decade has been enormous with a broad range of applications such as food quality, environmental analysis and life sciences [1,2]. On the other hand, the disadvantage of ambient pressure mass spectrometry techniques is the influence of the ambient background which can suppress the signal from the target. In AP MeV SIMS, molecular species present in ambient surrounding of the sampling site will also be ionised by ion beams hence secondary ions originating from the sample have to be transported in the most efficient manner from the site of interaction of ion beams and target into the mass spectrometer capillary and, finally, into the mass spectrometer [3]. In this work, we present the optimisation of the mass spectrometer capillary temperature, distances of mass spectrometer and sheath gas, in our case helium, with respect to the beam axis and angle of the helium flow capillary with respect to the sample.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :
Matjacic, Lidija
Demarche, Julien
Rosa, Lucio
Stori, Elis M.
Date : 1 June 2019
DOI : 10.1016/j.nimb.2019.03.034
Copyright Disclaimer : © 2019 Elsevier B.V. All rights reserved.
Uncontrolled Keywords : Ambient pressure MeV SIMS; Optimisation; Ion transport
Depositing User : Diane Maxfield
Date Deposited : 23 Aug 2019 14:50
Last Modified : 23 Aug 2019 14:50

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