Observation of Translation-to-Vibration Excitation in Acetylene Scattering from Au(111): A REMPI Based Approach
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and
Abstract
We present quantum-state and velocity resolved experiments for molecular beam scattering of acetylene (C2H2) from a single-crystal Au(111) surface, observations that reveal translational, rotational and vibrational inelasticity. The experiments are made possible by a novel (1 + 2) REMPI scheme for acetylene. The scattered molecules' velocity distributions as well as their ro-vibrational quantum-state distributions depend on the translational energy of incidence, EI, providing unambiguous evidence that the scattered molecules were not trapped and equilibrated on the surface. We report the EI-dependence of the collisional excitation of one and two quanta of the trans-bending vibrational mode, ν4 = 0 → 1, 2, which is consistent with a mechanism involving conversion of incidence translational energy to acetylene vibration. Rotationally resolved velocity measurements on scattered acetylene in its ground vibrational state are interpreted in terms of orientation-dependent rotational and vibrational excitation probabilities.
Acknowledgement
We are very grateful to Professor Robert W. Field for his advice on spectroscopy of acetylene. We thank Professor Daniel J. Auerbach for his careful reading of the manuscript and for useful discussions. JHB thanks Dr. C. Western for his assistance with PGOPHER, including the gracious addition of new features for use in this work. AMW and CB acknowledge support from the Alexander von Humboldt foundation.
©2015 Walter de Gruyter Berlin/Boston
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Articles in the same Issue
- Frontmatter
- Preface
- Congratulations to Jürgen Troe
- The Kinetics of the Reaction C2H5• + HI → C2H6 + I• over an Extended Temperature Range (213–623 K): Experiment and Modeling
- Collisional Relaxation of NCN: An Experimental Study with Laser-Induced Fluorescence
- Reaction of Chlorine Molecules with Unsaturated Submicron Organic Particles
- Theoretical Kinetics Study of the Reactions Forming the ClCO Radical Cycle in the Middle Atmosphere of Venus
- On the Relation between Population Kinetics and State-to-State Rate Coefficients for Vibrational Energy Transfer
- Investigation of the ν2 + 2ν3 Subband in the Overtone Icosad of 13CH4 by Pulsed Supersonic Jet and Diode Laser Cavity Ring-Down Spectroscopy: Partial Rovibrational Analysis and Nuclear Spin Symmetry Conservation
- The Rotationally-Resolved Absorption Spectrum of Formaldehyde from 6547 to 7051 cm−1
- Constraining the Conformational Landscape of a Polyether Building Block by Raman Jet Spectroscopy
- The Reaction Kinetics of Amino Radicals with Sulfur Dioxide
- Challenging High-Level ab initio Rovibrational Spectroscopy: The Nitrous Oxide Molecule
- Reaction of the CF3 Radical with Various Cations (Ar+, Xe+, O2+, NO+, CO2+, C2F5+)
- Electronic Spectra of Corannulenic Cations and Neutrals in Neon Matrices and Protonated Corannulene in the Gas Phase at 15 K
- Photoionization Yields in Intense fs-Laser Fields – A Systematic Investigation of Chirp Effects
- Determination of the Temperature-Dependent OH− (H2O) + CH3I Rate Constant by Experiment and Simulation
- Can we Observe Gas Phase Nucleation at the Molecular Level?
- Multiphoton Ionization of Liquid-to-Supercritical Methanol. Ultrafast Dynamics of Electron Localization and Geminate Recombination
- Femtosecond Infrared Spectroscopy of Aroylperoxide Photofragmentation – Site Selective Decarboxylation
- Excited State Dynamics of Selected All-trans C40 Xanthophyll Carotenoids
- Complexation and Chiral Recognition of Chiral Binaphthyl Derivatives and β-Cyclodextrins in Solution Probed by Triplet Excited State Relaxation
- Ionic Solutions Probed by Resonant Inelastic X-ray Scattering
- Ordering Phenomena in Surfactant Systems: From Micellar Solutions to Gel and Crystalline Phases
- Investigation of the Growth Behaviour of Cobalt Thin Films from Chemical Vapour Deposition, Using Directly Coupled X-ray Photoelectron Spectroscopy
- Ultrafast Dynamics of the Indoline Dye D149 on Mesoporous ZnO and Al2O3 Thin Films
- Observation of Translation-to-Vibration Excitation in Acetylene Scattering from Au(111): A REMPI Based Approach
