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Title: Quantum-state-resolved reactivity of overtone excited CH 4 on Ni(111): Comparing experiment and theory

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.4975025· OSTI ID:1344086
 [1];  [1];  [1];  [2]; ORCiD logo [2]
  1. Swiss Federal Institute of Technology in Lausanne (Switzerland). Lab of Molecular and Chemical Physics
  2. Univ. of Massachusetts, Amherst, MA (United States). Dept. of Chemistry

Quantum state resolved reactivity measurements probe the role of vibrational symmetry on the vibrational activation of the dissociative chemisorption of CH4 on Ni(111). IR-IR double resonance excitation in a molecular beam was used to prepare CH4 in three different vibrational symmetry components A1, E, and F2 of the 2ν32 antisymmetric stretch overtone vibration as well as in the ν1+ν3 symmetric plus antisymmetric C-H stretch combination band of F2 symmetry. We measured the quantum state specific dissociation probability S0 (sticking coefficient) for each of the four vibrational states by detecting chemisorbed carbon on Ni(111) as the product of CH4 dissociation by Auger electron spectroscopy. We also observe strong mode specificity, where S0 for the most reactive state ν13 is an order of magnitude higher than for the least reactive, more energetic 2ν3-E state. Our first principles quantum scattering calculations show that as molecules in the ν1 state approach the surface, the vibrational amplitude becomes localized on the reacting C-H bond, making them very reactive. We found that this behavior results from the weakening of the reacting C-H bond as the molecule approaches the surface, decoupling its motion from the three non-reacting C-H stretches. Similarly, we find that overtone normal mode states with more ν1 character are more reactive: S0(2ν1) > S013) > S0(2ν3). The 2ν3 eigenstates excited in the experiment can be written as linear combinations of these normal mode states. The highly reactive 2ν1 and ν13 normal modes, being of A1 and F2 symmetry, can contribute to the 2ν3-A1 and 2ν3-F2 eigenstates, respectively, boosting their reactivity over the E component, which contains no ν1 character due to symmetry.

Research Organization:
Univ. of Massachusetts, Amherst, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-87ER13744
OSTI ID:
1344086
Journal Information:
Journal of Chemical Physics, Vol. 146, Issue 5; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 6 works
Citation information provided by
Web of Science

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Cited By (2)

Transferability of the SRP32-vdW specific reaction parameter functional to CHD 3 dissociation on Pt(110)-(2 × 1) journal March 2019
Fundamental mechanisms for molecular energy conversion and chemical reactions at surfaces journal August 2019

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