NDSU Calendar

Thursday, April 4, 2013
4:00pm
Department of Chemistry and Biochemistry (Conference/Workshop/Seminar)

Fedor Rudakov, Oak Ridge National Laboratory (ORNL), Center for Engineering Science Advanced Research (CESAR), Oak Ridge, TN, will present a seminar entitled, "Molecular Structure and Dynamics Probed by Photoionization out of Rydberg States".
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Everyone is welcome!
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Abstract:
Probing the structure of a molecule as a chemical reaction unfolds has been a long standing goal in chemical physics. Most spectroscopic and diffraction techniques work well when the molecules are cold and thus vibrational motion is minimized. Yet, the very ability of a molecule to undergo structural changes implies that a significant amount of energy resides within the molecule. Well-established techniques are generally inapplicable to studying ultrafast molecular transformations except for highly favorable cases. In order to probe structures of even medium sized molecules on an ultrafast time scale a technique that is sensitive to the molecular structure, yet insensitive to the vibrational motion is required.

In our research, we demonstrated that Rydberg electrons are remarkably sensitive to the molecular structure. Photoionization of a molecule out of Rydberg states reveals a purely electronic spectrum which is largely insensitive to vibrational motion. The talk illustrates how Rydberg electrons can serve as a probe for ultrafast structural dynamics in polyatomic molecules. I will also present a technique for standoff and non-intrusive trace chemical sensing which probes transitions between molecular Rydberg states.

More information...
Location: Ladd 107
Price: Free
Host: Department of Chemistry and Biochemistry
Contact: Wendy J. Leach
E-Mail: wendy.leach@ndsu.edu

701-231-8694

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