On the problem of rotational-state-dependent molecule–surface interaction: Relaxation, accommodation and trapping at low J

Pankov, A. Yu.; Krylov, S. Yu.; Duijn, E.J. van; Hermans, L. J. F.

doi:10.1063/1.481470

Cited by 4 publications

(5 citation statements)

References 28 publications

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“…First, surface reactivity measurements are performed by probing a single rotational state, whereas the surface reaction probability of molecules and radicals can be rotational state dependent. 25 In this and previous work, 10,12 however, no difference in surface reactivity has been observed with different rotational states of SiH or for other radicals. A second, related issue is that the rotational state of SiH can change after interacting with the substrate as a result of thermal equilibration on the surface.…”

Section: Methodsmentioning

confidence: 58%

“…There are four issues that need to be addressed associated with using the IRIS method for measuring surface reactivities of radicals. First, surface reactivity measurements are performed by probing a single rotational state, whereas the surface reaction probability of molecules and radicals can be rotational state dependent . In this and previous work, , however, no difference in surface reactivity has been observed with different rotational states of SiH or for other radicals.…”

Section: Methodsmentioning

confidence: 79%

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Surface Reactivity and Plasma Energetics of SiH Radicals during Plasma Deposition of Silicon-Based Materials

et al. 2002

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The surface reactivity of the SiH radical was measured during plasma deposition of various silicon-based materials using the imaging of radicals interacting with surfaces (IRIS) method. In this technique, spatially resolved laser-induced fluorescence (LIF) is used to determine surface reaction probabilities, R or , of plasma species. For SiH, R is near unity, 0.96 ( 0.04, and shows no dependence on the gas mixture (SiH

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Section: Methodsmentioning

confidence: 58%

Section: Methodsmentioning

confidence: 79%

Surface Reactivity and Plasma Energetics of SiH Radicals during Plasma Deposition of Silicon-Based Materials

et al. 2002

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“…By contrast, a is found to increase with increasing J for the case studied. A qualitative explanation along the lines of the unified approach [4] is under way [5,6,16].…”

Section: Surface Light-induced Driftmentioning

confidence: 99%

“…A consequence is that a direct comparison between beam data and transport data is no longer possible: molecular beams produce so-called "beam accommodation coefficients" rather than the traditional "global" accommodation coefficients, which are obtainable only by integration over different directions and energies. It is fortunate that the "unified kinetic approach" developed by Borman, Krylov and coworkers does build a bridge between the two types of data sources (see, e.g., [4,5,6]).…”

Section: Introductionmentioning

confidence: 99%

Microscale Molecular Tennis

Hermans¹

2003

AIP Conference Proceedings

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Most of the cutting-edge research on molecule-surface interactions has been taken over by molecular-beam experiments. Even so, work on transport properties-much in the spirit of Lloyd Thomas-has been yielding subtle information on the role of the internal state that is difficult to obtain by other methods. Two such transport experiments are highlighted. One is the influence of an external magnetic field on a Knudsen flow. It gives information on nonequilibrium angular momentum polarizations produced by nonspherical molecule-surface interactions. The other is Surface Light-Induced Drift. It gives information on the rotational and vibrational-state dependence of accommodation coefficients. This includes the role of the direction of the angular momentum with respect to the surface ("helicopter" vs. "cartwheel"). MAGNETC FIELD EFFECT ON KNUDSEN FLOW In any Knudsen transport situation, the nonequilibrium velocity distribution will, by nonspherical molecule-surface interaction, also cause the angular momentum distribution to be anisotropic. This coupling between v-space and Jspace will have its impact on the transport. This can be made visibe by changing the anisotropy in J-space using the

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“…Systems with CH 3 F, OCS, or HF as resonant gases contained in stainless steel, platinum, sapphire, quartz, glass or teflon capillaries, as well as in capillaries coated with LiF or a stearic acid monolayer have been investigated. Data obtained from these SLID experiments became the basis for testing a unified theoretical approach to particle-surface interaction [5,6]. To our knowledge, SLID has not been observed in atomic vapours.…”

Section: Introductionmentioning

confidence: 99%

Flux measurements of alkali atoms diffusing via multiple surface scattering in a silanated glass tube

Waxman

Morgus

Streater

2002

J. Phys. B: At. Mol. Opt. Phys.

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Alkali atoms that are diffusing away from a source via multiple surface scattering in a nonstick coated glass tube are monitored by laser fluorescence. Densities are measured by fluorescence intensity and weak-field absorption, and small asymmetries in the line shape provide a measurement of the flux. Average velocities as small as 0.3% of the thermal velocity can be resolved using the technique presented. Model calculations are presented and fit to the data, providing approximate values for the sticking probability, and the probability of specular scattering versus diffuse scattering (related to momentum accommodation). For the silane-based coating SurfaSilTM, we find that the scattering is mostly diffuse, and that the sticking probability is of the order of 10−4 or 10−3. With refinement, the technique can be used to measure the variation in the sticking probability along the length of the tube, which could be useful for studying and improving gas separation columns. We present numerical calculations of surface light-induced drift (SLID) effects, but no evidence for SLID is observed experimentally.

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On the problem of rotational-state-dependent molecule–surface interaction: Relaxation, accommodation and trapping at low J

Cited by 4 publications

References 28 publications

Surface Reactivity and Plasma Energetics of SiH Radicals during Plasma Deposition of Silicon-Based Materials

Surface Reactivity and Plasma Energetics of SiH Radicals during Plasma Deposition of Silicon-Based Materials

Microscale Molecular Tennis

Flux measurements of alkali atoms diffusing via multiple surface scattering in a silanated glass tube

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