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Poster Session

Poster Session I (4pm-6pm CDT)

4:00 pm – 6:00 pm, Tuesday June 4 Session D00
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Imaging of coherent bending vibrations in SO2+

Poster 40
Presenter: Hung V Hoang (Kansas State University)
Authors: Huynh Van Sa Lam (Kansas State University), Artem Rudenko (Kansas State University), Uwe Thumm (Kansas State University)

Recent experiments have shown that bending vibrations in laser-ionized SO2 molecules can be directly mapped by time-resolved Coulomb explosion imaging (CEI). Here, we theoretically model the outcome of such IR pump – IR probe CEI experiment on SO2 in full dimensionality.  We describe the pump step by solving the coupled-channel Schrödinger equation for the nuclear motion on two coupled Born-Oppenheimer potential-energy surfaces, SO2 [X1A1 ] and SO2+ [X2A1 ]  (neutral and ionic electronic ground states, respectively). Employing ab initio calculated potential-energy surfaces, we calculate the  ionization yield as a function of time delay and OSO bond angle. We classically model the subsequent Coulomb explosion of  into the triply-charged S++O++O+ state and simulate the distribution of the asymptotic angles between the momentum vectors of O+ fragments as a function of the pump – probe time delay. In good agreement with our experimental data, this distribution clearly reveals a ~85 fs oscillation corresponding to bending vibrations in the SO2+ [X2A1 ] state.

 

 

 

 




 


Funding acknowledgement

Supported under grant DEFG02-86ER13491 by the U.S. Department of Energy, Office of Science.

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