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Title: Ultrafast Dynamics of 1,3-Cyclohexadiene in Highly Excited States

The ultrafast dynamics of 1,3-cyclohexadiene has been investigated via structurally sensitive Rydberg electron binding energies and shown to differ upon excitation to the 1B state and the 3p Rydberg state. Excitation of the molecule with 4.63 eV photons into the ultrashort-lived 1B state yields the well-known ring opening to 1,3,5-hexatriene, while a 5.99 eV photon lifts the molecule directly into the 3p-Rydberg state. Excitation to 3p does not induce ring opening. In both experiments, time-dependent shifts of the Rydberg electron binding energy reflect the structural dynamics of the molecular core. Structural distortions associated with 3p-excitation cause a dynamical shift in the - and -binding energies by 10 and 26 meV/ps, respectively, whereas after excitation into 1B, more severe structural transformations along the ring-opening coordinate produce shifts at a rate of 40 to 60 meV/ps. The experiment validates photoionization-photoelectron spectroscopy via Rydberg states as a powerful technique to observe structural dynamics of polyatomic molecules.
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [1]
  1. Department of Chemistry, Brown University, Providence, RI 02912, USA
  2. LCLS Laser Department, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
  3. Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
Publication Date:
OSTI Identifier:
1227783
Grant/Contract Number:
FG02-03ER15452
Type:
Published Article
Journal Name:
Journal of Atomic, Molecular, and Optical Physics
Additional Journal Information:
Journal Volume: 2011; Related Information: CHORUS Timestamp: 2016-09-07 11:57:52; Journal ID: ISSN 1687-9228
Publisher:
Hindawi Publishing Corporation
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
Country unknown/Code not available
Language:
English