Reactive scattering of ground-state and electronically excited oxygen atoms on a liquid hydrocarbon surface

Garton, Donna J.; Minton, Timothy K.; Alagia, Michele; Balucani, Nadia; Casavecchia, Piergiorgio; Volpi, G. G.

doi:10.1039/a706832h

Cited by 64 publications

(118 citation statements)

References 32 publications

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“…Corresponding average fractions of available energy appearing in OH translation (f t ) and rotation (f rot ) and deposited in the surface (f sur ). It is assumed throughout that the O( 3 P) atoms which react carry an average translational energy of 21 mechanistically the H-abstraction reactions with squalane and squalene are very similar. The significant differences in rotational energy release (see Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Examples include the reactions with F, 17,18 Cl, 19 O( 1 D), 20 and O( 3 P). [21][22][23][24][25][26][27][28][29] Of these, the O( 3 P) + squalane reaction is the most thoroughly characterised. The reaction produces OH radicals by abstraction of a hydrogen atom.…”

Section: Introductionmentioning

confidence: 99%

“…The reaction produces OH radicals by abstraction of a hydrogen atom. Experimental studies by Minton and co-workers [21][22][23] employed mass-spectrometric detection to obtain the speed and angular distributions of the OH products. Their method also allowed detection of the inelastically scattered reactant O( 3 P) atoms, and of the secondary product H 2 O.…”

Section: Introductionmentioning

confidence: 99%

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Site and bond-specific dynamics of reactions at the gas–liquid interface

Tesa-Serrate

King

Paterson

et al. 2014

Phys. Chem. Chem. Phys.

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The dynamics of the interfacial reactions of O((3)P) with the hydrocarbon liquids squalane (C30H62, 2,6,10,15,19,23-hexamethyltetracosane) and squalene (C30H50, trans-2,6,10,15,19,23-hexamethyltetracosa-2,6,10,14,18,22-hexaene) have been studied experimentally. Laser-induced fluorescence (LIF) was used to detect the nascent gas-phase OH products. The O((3)P) atoms are acutely sensitive to the chemical differences of the squalane and squalene surfaces. The larger exothermicity of abstraction from allylic C-H sites in squalene is reflected in markedly hotter OH rotational and vibrational distributions. There is a more modest increase in translational energy release. A larger fraction of the available energy is deposited in the liquid for squalene than for squalane, consistent with a more extensive geometry change on formation of the allylic radical co-product. Although the dominant reaction mechanism is direct, impulsive scattering, there is some evidence for OH being accommodated at both liquid surfaces, resulting in thermalised translation and rotational distributions. Despite the H-abstraction reaction being strongly favoured energetically for squalene, the yield of OH is substantially lower than for squalane. This is very likely due to competitive addition of O((3)P) to the unsaturated sites in squalene, implying that double bonds are extensively exposed at the liquid surface.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Site and bond-specific dynamics of reactions at the gas–liquid interface

Tesa-Serrate

King

Paterson

et al. 2014

Phys. Chem. Chem. Phys.

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“…Signal sizes were referenced against interleaved measurements of the well-studied standard, squalane. [32][33][34][35][36][37][38][39][40] To achieve the desired precision, the appearance profiles were averaged over typically ten sets of independent measurements over several different days for each mixture studied. They were corrected for a small background signal caused by a HONO impurity in the chamber by the procedure described previously.…”

Section: Reactive Atom Scatteringmentioning

confidence: 99%

Determining the composition of the vacuum–liquid interface in ionic-liquid mixtures

et al. 2018

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“…13,14,35,36 Other gas-surface processes that could involve OH radicals include ion-mediated reactions 37 such as Process 5, which would produce OH at the surface, and Process 6, OH surface recombination to produce H 2 O 2 , 38 which would consume OH at the surface.…”

Section: Discussionmentioning

confidence: 99%

Surface Reactivity of OH Molecules during Deposition of SiO₂ from Siloxane-Based Plasmas

Zhang

Fisher

2004

J. Phys. Chem. B

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The surface interactions of OH(X 2 Π) radicals during SiO 2 deposition from 1,3,5,7-tetramethylcyclotetrasiloxane (TMCTS)/oxidant (O 2 or N 2 O) and dimethyldimethoxysilane (DMDMOS)/oxidant (O 2 or N 2 O) plasmas have been measured by using the imaging of radicals interacting with surfaces (IRIS) method. The reactivity of OH at the surface of a growing SiO 2 film has been determined as a function of the applied rf plasma power (P), the precursor-to-oxidant ratio, and the substrate temperature (T s ). For both Si precursors, the surface reactivity (R) of OH during SiO 2 deposition on a 300 K Si substrate is ∼0.60 and is unaffected by changing precursor:oxidant ratio but does increase slightly with P. In contrast, at higher substrate temperatures (T s > 350 K), R decreases to 0.16 ( 0.10 for 1:10 TMCTS/O 2 plasma (P ) 100 W) and to 0.42 ( 0.03 for 1:10 DMDMOS/O 2 plasma (P ) 100 W). The rotational (Θ R ) and translational (Θ T ) temperatures of the OH radicals have also been determined. The formation and role of OH in SiO 2 deposition are discussed and compared with previous results for TEOS/O 2 plasmas.

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Reactive scattering of ground-state and electronically excited oxygen atoms on a liquid hydrocarbon surface

Cited by 64 publications

References 32 publications

Site and bond-specific dynamics of reactions at the gas–liquid interface

Site and bond-specific dynamics of reactions at the gas–liquid interface

Determining the composition of the vacuum–liquid interface in ionic-liquid mixtures

Surface Reactivity of OH Molecules during Deposition of SiO₂ from Siloxane-Based Plasmas

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Reactive scattering of ground-state and electronically excited oxygen atoms on a liquid hydrocarbon surface

Cited by 64 publications

References 32 publications

Site and bond-specific dynamics of reactions at the gas–liquid interface

Site and bond-specific dynamics of reactions at the gas–liquid interface

Determining the composition of the vacuum–liquid interface in ionic-liquid mixtures

Surface Reactivity of OH Molecules during Deposition of SiO2 from Siloxane-Based Plasmas

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Product

Resources

About

Surface Reactivity of OH Molecules during Deposition of SiO₂ from Siloxane-Based Plasmas