Ultrafast dynamics of excited electronic states in nitrobenzene measured
by ultrafast transient polarization spectroscopy
- URL: http://arxiv.org/abs/1912.12902v1
- Date: Mon, 30 Dec 2019 12:07:23 GMT
- Title: Ultrafast dynamics of excited electronic states in nitrobenzene measured
by ultrafast transient polarization spectroscopy
- Authors: Richard Thurston, Matthew M. Brister, Liang Z. Tan, Elio G.
Champenois, Said Bakhti, Pavan Muddukrishna, Thorsten Weber, Ali Belkacem,
Daniel S.Slaughter, and Niranjan Shivaram
- Abstract summary: We investigate ultrafast dynamics of the lowest singlet excited electronic state in liquid nitrobenzene.
The third-order non-linear response of the excited molecular ensemble is highly sensitive to details of excited state character and geometries.
By measuring this response as a function of time delays between the three pulses involved, we extract the dephasing time of the wave-packet on the excited state.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We investigate ultrafast dynamics of the lowest singlet excited electronic
state in liquid nitrobenzene using Ultrafast Transient Polarization
Spectroscopy (UTPS), extending the well-known technique of Optical-Kerr Effect
(OKE) spectroscopy to excited electronic states. The third-order non-linear
response of the excited molecular ensemble is highly sensitive to details of
excited state character and geometries and is measured using two femtosecond
pulses following a third femtosecond pulse that populates the S1 excited state.
By measuring this response as a function of time delays between the three
pulses involved, we extract the dephasing time of the wave-packet on the
excited state. The dephasing time measured as a function of time-delay after
pump excitation shows oscillations indicating oscillatory wave-packet dynamics
on the excited state. From the experimental measurements and supporting
theoretical calculations, we deduce that the wave-packet completely leaves the
S1 state surface after three traversals of the inter-system crossing between
the singlet S1 and triplet T2 states.
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