Volume 251, 2024

Molecular beam scattering of ammonia from a dodecane flat liquid jet

Abstract

The evaporation and scattering of ND3 from a dodecane flat liquid jet are investigated and the results are compared with previous studies on molecular beam scattering from liquid surfaces. Evaporation is well-described by a Maxwell–Boltzmann flux distribution with a cos θ 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 0.49, which is higher than that of 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.

Graphical abstract: Molecular beam scattering of ammonia from a dodecane flat liquid jet

Associated articles

Article information

Article type
Paper
Submitted
12 dec 2023
Accepted
29 jan 2024
First published
17 maj 2024

Faraday Discuss., 2024,251, 382-394

Molecular beam scattering of ammonia from a dodecane flat liquid jet

S. Saric, W. Yang and D. M. Neumark, Faraday Discuss., 2024, 251, 382 DOI: 10.1039/D3FD00169E

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