Abstract
We have investigated secondary ion yield enhancement using Bi 2+n (n=1, 3, 5) primary ions impacting phenylalanine, 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC), 1,2-dipalmitoyl-sn-glycero-3-phosphoethanolamine (DPPE), cholesterol, Irganox 1010, and polymer films adsorbed on silicon and aluminum. Secondary ion yields are increased using Bi2+and Bi 2+3 primary ions for the molecular layers and polymers that can undergo allyl cation rearrangements. For Irganox 1010, the deprotonated molecular ion yields (m/z 1175; [M−H]−) are one to two times larger for Bi2+ and Bi 2+3 primary ions than for Bi+ and Bi +3 at the same primary ion velocities. In the positive ion mode, the largest fragment ion yield (m/z 899) is ∼1.5 times larger for Bi2+ ions than for Bi+. For Bi 2+3 the largest fragment ion yield is only ∼70% of the ion yield using Bi +3 , but the secondary ion yields of the fragment ions at m/z 57 and 219 are enhanced. For polymers that can undergo allyl cation rearrangement reactions the secondary ion yield enhancements of the monomer ions range from 1.3 to 4.3. For Bi 2+5 primary ions, secondary ion yields were the same or slightly larger than for Bi +5 in the negative ion mass spectra for Irganox 1010, but lower in the positive ion mode. No secondary ion yield enhancements were measured on polymer samples for Bi 2+5 . For all polymer films studied, secondary ion intensities from the oligomer regions are substantially decreased using Bi 2+n (n=1, 3, 5). We discuss differences in the ionization mechanisms for doubly and singly-charged Bi primary ion bombardment.
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Published online October 30, 2007
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Nagy, G., Lu, P. & Walker, A.V. An investigation of secondary ion yield enhancement using Bi 2+n (n=1, 3, 5) primary ions. J. Am. Soc. Spectrom. 19, 33–45 (2008). https://doi.org/10.1016/j.jasms.2007.10.016
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DOI: https://doi.org/10.1016/j.jasms.2007.10.016