Incident energy dependence of the scattering dynamics of water molecules on silicon and graphite surfaces: the effect on tangential momentum accommodation

Kinefuchi, Ikuya; Kotsubo, Yusuke; Osuka, Kenichi; Yoshimoto, Yuta; Miyoshi, Norikazu; Takagi, Shu; Matsumoto, Yoichiro

doi:10.1007/s10404-017-1850-6

Cited by 10 publications

(7 citation statements)

References 69 publications

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“…The TOF spectra are fitted using a linear combination of SS and MB distributions, representing IS and TD scattering channels, respectively. 74,75 The same SS parameters fit both spectra regardless of the jet type, similar to what was seen for argon scattering off a liquid squalane (P vap = 10 −7 Torr at 295 K) cylindrical jet and a wetted wheel, 37 indicating that the measured flat jet scattering signal reflects the interaction between the molecular beam and the liquid surface, rather than with the surrounding vapor sheath. Our data show more TD for Ne−dodecane scattering compared to the data in ref 37.…”

Section: Experimental Results and Analysissupporting

confidence: 66%

Evaporation and Molecular Beam Scattering from a Flat Liquid Jet

et al. 2022

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An experimental setup for molecular beam scattering from flat liquid sheets has been developed, with the goal of studying reactions at gas-liquid interfaces for volatile liquids. Specifically, a crossed molecular beam instrument that can measure angular and translational energy distributions of scattered products has been adapted for liquid jet scattering. A microfluidic chip is used to create a stable flat liquid sheet inside vacuum from which scattering occurs, and both evaporation and scattering from this sheet are characterized by a rotatable mass spectrometer that can measure product time-of-flight distributions. This manuscript describes the instrument and reports on first measurements of evaporation of dodecane and Ne from a Ne-doped dodecane flat jet, as well as scattering of Ne from a flat jet of pure dodecane.

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Section: Experimental Results and Analysissupporting

confidence: 66%

Evaporation and Molecular Beam Scattering from a Flat Liquid Jet

et al. 2022

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“…Conversely, thermal desorption is characterized by a scattered particle being trapped at the liquid surface for a period of time long enough to thermalize with the liquid and then evaporate according to a Maxwell-Boltzmann flux distribution at the liquid temperature (Tliq). 9,15,30,31 In our previous work, we demonstrated that both the fractional energy loss and TD fraction, defined as TD/(TD + IS), are higher for the polyatomic molecules than they are for Ne, and trend in a consistent manner with the free energy of solvation found in literature. 29 These results also agreed with previous work performed by Nathanson scattering these same small molecules from squalane using a wetted wheel, although his study was confined to a single deflection angle.…”

Section: Introductionsupporting

confidence: 87%

Molecular Beam Scattering of Ammonia from a Dodecane Flat Liquid Jet

Saric,

Yang,

Neumark

2023

Preprint

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The evaporation and scattering of ND3 from a dodecane flat liquid jet are investigated and compared to previous molecular beam scattering studies from liquid surfaces. Evaporation is well-described by a Maxwell–Boltzmann flux distribution with a cosθ angular distribution at the liquid temperature. Scattering experiments at Ei = 28.8 kJ mol−1 over a range of deflection angles show evidence for impulsive scattering and thermal desorption. At a deflection angle of 90°, the thermal desorption fraction is 0.54, which is ~4 % higher than other molecules previously scattered from dodecane and consistent with work performed on NH3 scattering from a squalane wetted wheel. ND3 scattering from dodecane results in super-specular scattering, as seen in previous experiments on dodecane. The impulsive scattering channel is fitted to a “soft-sphere” model, yielding an effective surface mass of 55 amu and an internal excitation of 5.08 kJ mol−1. Overall, impulsively scattered ND3 behaves similarly to other small molecules scattered from dodecane.

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“…The TOF spectra are then fitted with a linear combination of SS and MB distributions representing the IS and TD scattering channels, respectively. 29,69 Note that the fitting procedure involves convolution with the molecular beam temporal profiles shown in the bottom panels of Fig. 4.…”

Section: B Scatteringmentioning

confidence: 99%

Evaporation and scattering of neon, methane, and water from a dodecane flat liquid jet

Yang,

Lee,

Saric

et al. 2023

The Journal of Chemical Physics

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The evaporation and scattering of Ne, CD4, and D2O from a dodecane flat liquid jet are investigated in a molecular beam apparatus. The experiment yields translational energy distributions as a function of scattering angle by means of a rotatable mass spectrometer. In the evaporation experiments, one observes a Maxwell–Boltzmann distribution with a cos θ angular distribution superimposed on a weak, isotropic background. The scattering experiments show contributions from impulsive scattering and thermal desorption. At select incident angles for the three systems, angular distributions show super-specular scattering for the impulsive scattering channel, an effect attributed to anisotropic momentum transfer to the liquid surface. The impulsive scattering channel is analyzed with a soft-sphere model to explore energy transfer between the scatterer and liquid as a function of deflection angle. Compared to Ne scattering, the polyatomic gases exhibit more thermal desorption and, in the impulsive scattering channel, a higher degree of internal excitation.

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Incident energy dependence of the scattering dynamics of water molecules on silicon and graphite surfaces: the effect on tangential momentum accommodation

Cited by 10 publications

References 69 publications

Evaporation and Molecular Beam Scattering from a Flat Liquid Jet

Evaporation and Molecular Beam Scattering from a Flat Liquid Jet

Molecular Beam Scattering of Ammonia from a Dodecane Flat Liquid Jet

Evaporation and scattering of neon, methane, and water from a dodecane flat liquid jet

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