Hydronium ion motion in nanometer 3-methyl-pentane films

Richard C. Bell; Kai Wu; Martin J. Iedema; James P. Cowin

doi:10.1063/1.2748756

Hydronium ion motion in nanometer 3-methyl-pentane films

Richard C. Bell, Kai Wu, Martin J. Iedema, James P. Cowin

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

An ion soft-landing approach was applied to study the motion of hydronium (D3 O+) and cesium (Cs+) ions from 84 to 104 K in glassy 3-methyl-pentane (3MP) films vapor deposited on Pt(111). Both ions were found to have very similar mobilities in 3MP. The span of ion mobilities probed is from ∼ 10-18 to ∼ 10-13 m2 V-1 s-1. Ion transport in these films was studied as a function of film thickness and electric field strength. The drift velocity was found to be linear with applied field below about 2× 108 Vm and deviated from linearity above this. To a large extent, D3 O+ and Cs+ motion in 3MP was well predicted by a simple continuum-based ion mobility model in films from 25 to 20 000 ML thick (including pronounced perturbations 7 ML from both the vacuum and Pt interfaces). The mobility varied with temperature more slowly than predicted by Stokes' law, which may be due to extended inhomogeneous structures in the 3MP near its glass transition at 77 K.

Original language	English (US)
Article number	024704
Journal	Journal of Chemical Physics
Volume	127
Issue number	2
DOIs	https://doi.org/10.1063/1.2748756
State	Published - 2007

All Science Journal Classification (ASJC) codes

General Physics and Astronomy
Physical and Theoretical Chemistry

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10.1063/1.2748756

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@article{e338aa72f9324d27b4ca9eaa83d6c1d1,

title = "Hydronium ion motion in nanometer 3-methyl-pentane films",

abstract = "An ion soft-landing approach was applied to study the motion of hydronium (D3 O+) and cesium (Cs+) ions from 84 to 104 K in glassy 3-methyl-pentane (3MP) films vapor deposited on Pt(111). Both ions were found to have very similar mobilities in 3MP. The span of ion mobilities probed is from ∼ 10-18 to ∼ 10-13 m2 V-1 s-1. Ion transport in these films was studied as a function of film thickness and electric field strength. The drift velocity was found to be linear with applied field below about 2× 108 Vm and deviated from linearity above this. To a large extent, D3 O+ and Cs+ motion in 3MP was well predicted by a simple continuum-based ion mobility model in films from 25 to 20 000 ML thick (including pronounced perturbations 7 ML from both the vacuum and Pt interfaces). The mobility varied with temperature more slowly than predicted by Stokes' law, which may be due to extended inhomogeneous structures in the 3MP near its glass transition at 77 K.",

author = "Bell, {Richard C.} and Kai Wu and Iedema, {Martin J.} and Cowin, {James P.}",

note = "Funding Information: This work was supported by the U.S. Department of Energy Office of Basic Energy Sciences, Chemical Sciences Division, and it was performed at the W. R. Wiley Environmental Molecular Sciences Laboratory, a national scientific user facility sponsored by the Department of Energy{\textquoteright}s Office of Biological and Environmental Research and located at Pacific Northwest National Laboratory. Pacific Northwest National Laboratory is operated for the U.S. Department of Energy by Battelle under Contract No. DE-AC06-76RLO 1830.",

year = "2007",

doi = "10.1063/1.2748756",

language = "English (US)",

volume = "127",

journal = "Journal of Chemical Physics",

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publisher = "American Institute of Physics Publising LLC",

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T1 - Hydronium ion motion in nanometer 3-methyl-pentane films

AU - Bell, Richard C.

AU - Wu, Kai

AU - Iedema, Martin J.

AU - Cowin, James P.

N1 - Funding Information: This work was supported by the U.S. Department of Energy Office of Basic Energy Sciences, Chemical Sciences Division, and it was performed at the W. R. Wiley Environmental Molecular Sciences Laboratory, a national scientific user facility sponsored by the Department of Energy’s Office of Biological and Environmental Research and located at Pacific Northwest National Laboratory. Pacific Northwest National Laboratory is operated for the U.S. Department of Energy by Battelle under Contract No. DE-AC06-76RLO 1830.

PY - 2007

Y1 - 2007

N2 - An ion soft-landing approach was applied to study the motion of hydronium (D3 O+) and cesium (Cs+) ions from 84 to 104 K in glassy 3-methyl-pentane (3MP) films vapor deposited on Pt(111). Both ions were found to have very similar mobilities in 3MP. The span of ion mobilities probed is from ∼ 10-18 to ∼ 10-13 m2 V-1 s-1. Ion transport in these films was studied as a function of film thickness and electric field strength. The drift velocity was found to be linear with applied field below about 2× 108 Vm and deviated from linearity above this. To a large extent, D3 O+ and Cs+ motion in 3MP was well predicted by a simple continuum-based ion mobility model in films from 25 to 20 000 ML thick (including pronounced perturbations 7 ML from both the vacuum and Pt interfaces). The mobility varied with temperature more slowly than predicted by Stokes' law, which may be due to extended inhomogeneous structures in the 3MP near its glass transition at 77 K.

AB - An ion soft-landing approach was applied to study the motion of hydronium (D3 O+) and cesium (Cs+) ions from 84 to 104 K in glassy 3-methyl-pentane (3MP) films vapor deposited on Pt(111). Both ions were found to have very similar mobilities in 3MP. The span of ion mobilities probed is from ∼ 10-18 to ∼ 10-13 m2 V-1 s-1. Ion transport in these films was studied as a function of film thickness and electric field strength. The drift velocity was found to be linear with applied field below about 2× 108 Vm and deviated from linearity above this. To a large extent, D3 O+ and Cs+ motion in 3MP was well predicted by a simple continuum-based ion mobility model in films from 25 to 20 000 ML thick (including pronounced perturbations 7 ML from both the vacuum and Pt interfaces). The mobility varied with temperature more slowly than predicted by Stokes' law, which may be due to extended inhomogeneous structures in the 3MP near its glass transition at 77 K.

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Hydronium ion motion in nanometer 3-methyl-pentane films

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