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Title: Ultrafast X-Ray Scattering Measurements of Coherent Structural Dynamics on the Ground-State Potential Energy Surface of a Diplatinum Molecule

Journal Article · · Physical Review Letters
 [1];  [2];  [3];  [1];  [1];  [1];  [4];  [3];  [5];  [2];  [6];  [6];  [6];  [7];  [1];  [6];  [1];  [1];  [1]
  1. Technical Univ. of Denmark, Lyngby (Denmark)
  2. Technical Univ. of Denmark, Lyngby (Denmark); Science Inst. of the Univ. of Iceland, Reykjavik (Iceland)
  3. Technical Univ. of Denmark, Lyngby (Denmark); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  4. Technical Univ. of Denmark, Lyngby (Denmark); Lund Univ., Lund (Sweden); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  5. Technical Univ. of Denmark, Lyngby (Denmark); Lund Univ., Lund (Sweden)
  6. SLAC National Accelerator Lab. (SLAC), Menlo Park, CA (United States)
  7. SLAC National Accelerator Lab. (SLAC), Menlo Park, CA (United States); Paul Scherrer Inst. (PSI), Villigen (Switzerland)

We present x-ray free electron laser experiments addressing ground-state structural dynamics of the diplatinum anion Pt2POP4 following photoexcitation. The structural dynamics are tracked with < 100 fs time resolution by x-ray scattering, utilizing the anisotropic component to suppress contributions from the bulk solvent. The x-ray data exhibit a strong oscillatory component with period 0.28 ps and decay time 2.2 ps, and structural analysis of the difference signal directly shows this as arising from ground-state dynamics along the PtPt coordinate. Here, these results are compared with multiscale Born-Oppenheimer molecular dynamics simulations and demonstrate how off-resonance excitation can be used to prepare a vibrationally cold excited-state population complemented by a structure-dependent depletion of the ground-state population which subsequently evolves in time, allowing direct tracking of ground-state structural dynamics.

Research Organization:
SLAC National Accelerator Lab. (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1504721
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 6 Vol. 122; ISSN 0031-9007; ISSN PRLTAO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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