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Title: Ultrafast Adsorbate Excitation Probed with Subpicosecond-Resolution X-Ray Absorption Spectroscopy

Journal Article · · Physical Review Letters
ORCiD logo [1];  [2];  [2];  [2];  [1];  [3];  [2];  [4];  [5];  [5];  [5];  [5];  [5];  [5];  [5];  [6];  [2];  [2];  [7];  [2] more »;  [6];  [8];  [9];  [1];  [1];  [1];  [2] « less
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. Stockholm Univ. (Sweden)
  3. Chapman Univ., Orange, CA (United States)
  4. CNR-IOM, Trieste (Italy)
  5. Elettra-Sincrotrone Trieste (Italy)
  6. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  7. Stockholm Univ. (Sweden); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  8. CNR-IOM, Trieste (Italy); Univ. of Trieste (Italy)
  9. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States)

We use a pump-probe scheme to measure the time evolution of the C K-edge x-ray absorption spectrum from CO/Ru(0001) after excitation by an ultrashort high-intensity optical laser pulse. Because of the short duration of the x-ray probe pulse and precise control of the pulse delay, the excitation-induced dynamics during the first picosecond after the pump can be resolved with unprecedented time resolution. By comparing with density functional theory spectrum calculations, we find high excitation of the internal stretch and frustrated rotation modes occurring within 200 fs of laser excitation, as well as thermalization of the system in the picosecond regime. The ~100 fs initial excitation of these CO vibrational modes is not readily rationalized by traditional theories of nonadiabatic coupling of adsorbates to metal surfaces, e.g., electronic frictions based on first order electron-phonon coupling or transient population of adsorbate resonances. Finally, we suggest that coupling of the adsorbate to nonthermalized electron-hole pairs is responsible for the ultrafast initial excitation of the modes.

Research Organization:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; Knut and Alice Wallenberg Foundation; Swedish Research Council (SRC); SIR; Helmholtz association
Grant/Contract Number:
2016.0042; 2013-8823; AC02-76SF00515; AC02-05CH11231; VH-NG-1005; Nr RBSI14G7TL; CUP B82I15000910001
OSTI ID:
1814461
Journal Information:
Physical Review Letters, Vol. 127, Issue 1; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

References (41)

Instantaneous vibrational frequencies of diffusing and desorbing adsorbates: CO/Pt(111) journal July 2012
Chemical Bond Activation Observed with an X-ray Laser journal September 2016
Accuracy of XAS theory for unraveling structural changes of adsorbates: CO on Ni(100) journal November 2020
2π-resonance broadening in x-ray-absorption spectroscopy of adsorbed CO journal October 1992
Disentangling Multidimensional Nonequilibrium Dynamics of Adsorbates: CO Desorption from Cu(100) journal October 2016
Ultrafast Transient Dynamics of Adsorbates on Surfaces Deciphered: The Case of CO on Cu(100) journal January 2019
QUANTUM ESPRESSO: a modular and open-source software project for quantum simulations of materials journal September 2009
Desorption induced by multiple electronic transitions journal June 1992
Electronic structure calculations with GPAW: a real-space implementation of the projector augmented-wave method journal June 2010
An inverse photoemission study of CO adsorption on clean and potassium promoted Ru(001) journal November 1987
Theoretical approximations to X-ray absorption spectroscopy of liquid water and ice journal March 2010
Hot-band excitation of CO chemisorbed on Ru(001) studied with broadband-IR sum-frequency generation journal July 2000
Probing the transition state region in catalytic CO oxidation on Ru journal February 2015
Phonon- Versus Electron-Mediated Desorption and Oxidation of CO on Ru(0001) journal August 1999
Real-Time Observation of Surface Bond Breaking with an X-ray Laser journal March 2013
High-Gain Harmonic-Generation Free-Electron Laser journal August 2000
Effects of electronic relaxation processes on vibrational linewidths of adsorbates on surfaces: The case of CO/Cu(100) journal December 2016
Ultrafast electron dynamics at metal surfaces: Competition between electron-phonon coupling and hot-electron transport journal January 2000
Real-space grid implementation of the projector augmented wave method journal January 2005
Femtosecond laser induced associative desorption of H2 from Ru(0001): Comparison of “first principles” theory with experiment journal June 2006
Phonons and related crystal properties from density-functional perturbation theory journal July 2001
Vibrational dynamics of adsorbed molecules under conditions of photodesorption: Pump-probe SFG spectra of CO/Pt(111) journal September 2004
Real-Time Observation of Molecular Motion on a Surface journal December 2005
Soft x‐ray emission spectroscopy using monochromatized synchrotron radiation (invited) journal July 1989
Ultra-fast dynamics of electron thermalization, cooling and transport effects in Ru(001) journal January 2004
Applications of core level spectroscopy to adsorbates journal October 2002
Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set journal October 1996
Calculations of near-edge x-ray-absorption spectra of gas-phase and chemisorbed molecules by means of density-functional and transition-potential theory journal September 1998
Anisotropic atomic motions in structural analysis by low energy electron diffraction journal January 1993
X-ray emission spectroscopy of (23×23)R30°CO/Ru(0001): Comparison to c(2×2)CO/Ni(100) and c(2×2)CO/Cu(100) journal September 2004
Direct observation of electron dynamics in the attosecond domain journal July 2005
Femtosecond Surface Vibrational Spectroscopy of CO Adsorbed on Ru(001) during Desorption journal May 2000
Soft self-consistent pseudopotentials in a generalized eigenvalue formalism journal April 1990
X-ray absorption near-edge structure calculations with the pseudopotentials: Application to the K edge in diamond and α -quartz journal November 2002
Electron-phonon coupling and phonon self-energy in MgB 2 : Interpretation of MgB 2 Raman spectra journal February 2005
Adsorption on transition metal surfaces: Transferability and accuracy of DFT using the ADS41 dataset journal July 2019
Towards jitter-free pump-probe measurements at seeded free electron laser facilities journal January 2014
Advanced capabilities for materials modelling with Quantum ESPRESSO journal October 2017
Indication of non-thermal contribution to visible femtosecond laser-induced CO oxidation on Ru(0001) journal August 2015
Electron- and phonon-coupling in femtosecond laser-induced desorption of CO from Ru(0001) journal September 2013
Optical laser-induced CO desorption from Ru(0001) monitored with a free-electron X-ray laser: DFT prediction and X-ray confirmation of a precursor state journal October 2015