Dependence of Megaelectron Volt Time-of-Flight Secondary Ion Mass Spectrometry Secondary Molecular Ion Yield from Phthalocyanine Blue on Primary Ion Stopping Power

Brajković, Marko; Barac, Marko; Bogdanović Radović, Ivančica; Siketić, Zdravko (2020) Dependence of Megaelectron Volt Time-of-Flight Secondary Ion Mass Spectrometry Secondary Molecular Ion Yield from Phthalocyanine Blue on Primary Ion Stopping Power. Journal of The American Society for Mass Spectrometry, 31 (7). pp. 1518-1524. ISSN 1044-0305

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Official URL: https://pubs.acs.org/doi/pdf/10.1021/jasms.0c00080

Abstract

Time-of-flight secondary ion mass spectrometry (TOF SIMS) is a well-established mass spectrometry technique used for the chemical analysis of both organic and inorganic materials. In the last ten years, many advances have been made to improve the yield of secondary molecular ions, especially those desorbed from the surfaces of organic samples. For this reason, cluster ion beams with kiloelectron volt energies for the excitation were mostly used. Alternatively, single-ion beams with megaelectron volt energies can be applied, as was done in the present work. It is well-known that a secondary molecule/ion yield depends strongly on the primary ion stopping power, but the nature of this dependence is not completely clear. Therefore, in the present work, the secondary ion yield from the phthalocyanine blue (C32H16CuN8, organic pigment) was measured for the various combinations of ion masses, energies, and charge states. Measured values were compared with the existing models for ion sputtering. An increase in the secondary yield with the primary ion energy, electronic stopping, velocity, and charge state was found for different types of primary ions. Although this general behavior is valid for all primary ions, there is no single parameter that can describe the measured results for all primary ions at once.

Item Type:

Article

Uncontrolled Keywords:

MeV TOF SIMS; secondary ion yield; phthalocyanine blue; electronic stopping; primary ion charge state

Subjects:

NATURAL SCIENCES > Physics

Divisions:

Division of Experimental Physics

Projects:

Project title	Project leader	Project code	Project type
Research And Development with Ion Beams – Advancing Technology in Europe-RADIATE	Ivančica Bogdanović Radović	824096	EK
Razvoj kapilarne mikroprobe za MeV SIMS s primjenom na analizu bioloških materijala-BioCapSIMS	Ivančica Bogdanović Radović	IP-2016-06-1698	HRZZ

Depositing User:

Marko Brajković

Date Deposited:

01 Jul 2020 10:57

URI:

http://fulir.irb.hr/id/eprint/5828

DOI:

10.1021/jasms.0c00080