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Title: Mode-selective chemistry on metal surfaces: The dissociative chemisorption of CH4 on Pt(111)

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.4948941· OSTI ID:1253764

A quantum approach based on an expansion in vibrationally adiabatic eigenstates is used to explore CH4 dissociation on Pt(111). Computed sticking probabilities for molecules in the ground, 1v3 and 2v3, states are in very good agreement with the available experimental data, reproducing the variation in reactivity with collision energy and vibrational state. As was found in similar studies on Ni(100) and Ni(111), exciting the 1v1 symmetric stretch of CH4 is more effective at promoting the dissociative chemisorption of CH4 than exciting the 1v3 antisymmetric stretch. This behavior is explained in terms of symmetry, mode-softening, and nonadiabatic transitions between vibrationally adiabatic states. We find that the efficacies of the bending modes for promoting reaction are reasonably large, and similar to the 1v3 state. The vibrational efficacies for promoting reaction on Ni(111) are larger than for reaction on Pt(111), due to the larger nonadiabatic couplings. As a result, our computed sticking probabilities are in good agreement with results from recent ab initio molecular dynamics and reactive force field studies.

Research Organization:
Univ. of Massachusetts, Amherst, MA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
FG02-87ER13744
OSTI ID:
1253764
Alternate ID(s):
OSTI ID: 1253070
Journal Information:
Journal of Chemical Physics, Vol. 144, Issue 18; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

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Cited By (7)

Quantum-state-resolved reactivity of overtone excited CH 4 on Ni(111): Comparing experiment and theory journal February 2017
Methane dissociation on the steps and terraces of Pt(211) resolved by quantum state and impact site journal January 2018
Quantum dynamics studies of the dissociative chemisorption of CH 4 on the steps and terraces of Ni(211) journal December 2018
A modified generalized Langevin oscillator model for activated gas-surface reactions journal January 2019
Methane dissociation on stepped Ni surfaces resolved by impact site, collision energy, vibrational state, and lattice distortion journal May 2019
Dynamics in reactions on metal surfaces: A theoretical perspective journal May 2019
Fundamental mechanisms for molecular energy conversion and chemical reactions at surfaces journal August 2019

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