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Title: Time-resolved electron spectroscopy for chemical analysis of photodissociation: Photoelectron spectra of Fe(CO)5, Fe(CO)4, and Fe(CO)3

Journal Article · · Journal of Chemical Physics
DOI: https://doi.org/10.1063/1.5035149 · OSTI ID:1468956
 [1]; ORCiD logo [2];  [3]; ORCiD logo [4];  [5]; ORCiD logo [4];  [6];  [7];  [8];  [5];  [9]; ORCiD logo [2]; ORCiD logo [1]
  1. Helmholtz-Zentrum Berlin fur Materialien und Energie GmbH, Berlin (Germany)
  2. Stockholm Univ., Stockholm (Sweden)
  3. European XFEL GmbH, Schenefeld (Germany)
  4. Helmholtz-Zentrum Berlin fur Materialien und Energie GmbH, Berlin (Germany); Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  5. Helmholtz-Zentrum Berlin fur Materialien und Energie GmbH, Berlin (Germany); Univ. Potsdam, Potsdam (Germany)
  6. Helmholtz-Zentrum Berlin fur Materialien und Energie GmbH, Berlin (Germany); Univ. Potsdam, Potsdam (Germany); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  7. Helmholtz-Zentrum Berlin fur Materialien und Energie GmbH, Berlin (Germany); Univ. Potsdam, Potsdam (Germany); Stockholm Univ., Stockholm (Sweden)
  8. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  9. European XFEL GmbH, Schenefeld (Germany)

The prototypical photoinduced dissociation of Fe(CO)5 in the gas phase is used to test time-resolved x-ray photoelectron spectroscopy for studying photochemical reactions. Upon one-photon excitation at 266 nm, Fe(CO)5 successively dissociates to Fe(CO)4 and Fe(CO)3 along a pathway where both fragments retain the singlet multiplicity of Fe(CO)5. The x-ray free-electron laser FLASH is used to probe the reaction intermediates Fe(CO)4 and Fe(CO)3 with time-resolved valence and core-level photoelectron spectroscopy, and experimental results are interpreted with ab initio quantum chemical calculations. Changes in the valence photoelectron spectra are shown to reflect changes in the valence-orbital interactions upon Fe–CO dissociation, thereby validating fundamental theoretical concepts in Fe–CO bonding. Chemical shifts of CO 3σ inner-valence and Fe 3p core-level binding energies are shown to correlate with changes in the coordination number of the Fe center. We interpret this with coordination-dependent charge localization and core-hole screening based on calculated changes in electron densities upon core-hole creation in the final ionic states. This extends the established capabilities of steady-state electron spectroscopy for chemical analysis to time-resolved investigations. Lastly, it could also serve as a benchmark for how charge and spin density changes in molecular dissociation and excited-state dynamics are expressed in valence and core-level photoelectron spectroscopy.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1468956
Journal Information:
Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 4 Vol. 149; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Chemical interactions and dynamics with femtosecond X-ray spectroscopy and the role of X-ray free-electron lasers journal April 2019
The effect of coordination of alkanes, Xe and CO 21 -OCO) on changes in spin state and reactivity in organometallic chemistry: a combined experimental and theoretical study of the photochemistry of CpMn(CO) 3 journal January 2019
Chemical interactions and dynamics with femtosecond X-ray spectroscopy and the role of X-ray free-electron lasers journal April 2019
Chemical interactions and dynamics with femtosecond X-ray spectroscopy and the role of X-ray free-electron lasers text January 2019

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