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Controlling Fragmentation of the Acetylene Cation in the Vacuum Ultraviolet via Transient Molecular Alignment

Journal Article · · Journal of Physical Chemistry Letters
 [1];  [2];  [3];  [4];  [5];  [3];  [6];  [7];  [3];  [8];  [3];  [9];  [10];  [3];  [11];  [12];  [13];  [14];  [14];  [15] more »;  [3];  [3];  [16];  [3];  [13];  [17];  [13];  [18];  [2];  [19] « less
  1. Dublin City University (Ireland); SLAC
  2. Univ. Autonoma de Madrid (Spain); Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA), Madrid (Spain)
  3. Elettra-Sincrotrone Trieste (Italy)
  4. Atlantic Technological University (Ireland)
  5. Univ. Autonoma de Madrid (Spain)
  6. Univ. of Bern (Switzerland); Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  7. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Linac Coherent Light Source (LCLS)
  8. Univ. degli Studi di Trieste (Italy)
  9. The Ohio State Univ., Columbus, OH (United States)
  10. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  11. Technische Univ. of Dortmund (Germany)
  12. Universität Kassel (Germany); European XFEL, Schenefeld (Germany)
  13. Technische Univ. Munchen, Garching (Germany)
  14. European XFEL, Schenefeld (Germany)
  15. Max Planck Inst. fuer Kernphysik, Heidelberg (Germany)
  16. Elettra-Sincrotrone Trieste (Italy); Swinburne University of Technology, VIC (Australia)
  17. Tohoku Univ., Sendai (Japan)
  18. Elettra-Sincrotrone Trieste (Italy); Consiglio Nazionale delle Ricerche (CNR), Trieste (Italy)
  19. Dublin City University (Ireland)
+ Show Author Affiliations
An open-loop control scheme of molecular fragmentation based on transient molecular alignment combined with single-photon ionization induced by a short-wavelength free electron laser (FEL) is demonstrated for the acetylene cation. Photoelectron spectra are recorded, complementing the ion yield measurements, to demonstrate that such control is the consequence of changes in the electronic response with molecular orientation relative to the ionizing field. We show that stable C2H2+ cations are mainly produced when the molecules are parallel or nearly parallel to the FEL polarization, while the hydrogen fragmentation channel (C2H2+ → C2H+ + H) predominates when the molecule is perpendicular to that direction, thus allowing one to distinguish between the two photochemical processes. The experimental findings are supported by state-of-the art theoretical calculations.
Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
2006463
Journal Information:
Journal of Physical Chemistry Letters, Journal Name: Journal of Physical Chemistry Letters Journal Issue: 1 Vol. 14; ISSN 1948-7185
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (4)

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
cations
hydrocarbons
ionization
lasers
molecules