Soft-landing of polyatomic ions at fluorinated self-assembled monolayer surfaces

Science

Volumn 275, Issue 5305, 1997, Pages 1447-1450

  Miller, S A ^a   Luo, H ^a   Pachuta, S J ^b   Cooks, R G ^a  

^a PURDUE UNIVERSITY   (United States)

^b 3M COMPANY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ION;

ARTICLE; GAS; ISOTOPE LABELING; MOLECULAR DYNAMICS; MOLECULAR INTERACTION; PRIORITY JOURNAL; SURFACE PROPERTY;

EID: 0031039897     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.275.5305.1447     Document Type: Article

References (30)

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20. The image in Fig. 1 was produced with the program CAChe, version 3.7 (CAChe Scientific, Beaverton, OR).
21. F-SAM chain spacings were set according to G. Liu et al., J. Chem. Phys. 101, 4301 (1994).
22. 2SH in ethanol for at least a few days. The surfaces were then rinsed and sonicated in ethanol several times before modification by the low-energy ion beams. The substrate consists of a glass layer, 1.6 mm thick, covered with 50 Å of Ti and 1000 Å of polycrystalline gold.
23. 2).
24. The number of sputtered ions was estimated by converting the total analog-to-digital converter counts in the sputtered ion decay curve of the deposited species into an ion current and estimating corrections for the gain, transmission, and spot sizes of the experiment.
25. .+ sputtering analysis before the sample was sent to 3M Center (St. Paul, MN) for TOF-SIMS analysis.
26. The cross section for sputtered ion yields is maximized when the recombination energy is in resonance with the ionization energy of the neutral molecule [see J. B. Hasted, Physics of Atomic Collisions (American Elsevier, New York, ed. 2, 1972), p. 612]. Neutralization and deposition of the resulting radicals into the surface is not precluded; this is likely to be one of the ion loss processes leading to low yields.
27. These experiments were performed with a Finnigan TSQ 700 triple-quadrupole mass spectrometer with the ion source filament turned off. The sample was mounted on a specially constructed direct insertion probe that heated the surface from room temperature to 400°C in 40 s. Well-defined peaks from desorbed ions were observed in plots of ion abundance versus time. The trapped ions that are thermally released might not be as tightly held as those desorbed by ion impact.
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30. Supported by NSF grant CHE-9223791. We thank B. Feng for assistance in the F-SAM surface preparation, D. Lantrip for the CAChe simulations, G. Chen for the triple-quadrupole data, Y. H. Yim for the trifluoromethylbenzoyl data, and T. Bein, W. N. Delgass, B. S. Freiser, H. W. Rohrs, and V. H. Wysocki for helpful comments.