Bulletin of the American Physical Society
Annual Meeting of the APS Four Corners Section
Volume 60, Number 11
Friday–Saturday, October 16–17, 2015; Tempe, Arizona
Session E1: Atomic, Molecular and Optical Physics III |
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Chair: Mark Siemens, University of Denver Room: MU236 |
Friday, October 16, 2015 3:17PM - 3:41PM |
E1.00001: What 1-Kelvin plasmas can tell you about thermonuclear fusion Invited Speaker: Scott Bergeson The pursuit of efficient plasma fusion is a quest to optimize the right kinds of ion-ion collisions -- the collisions that lead to fusion. These "good" collisions are intentionally left out of normal plasma models because they are theoretically messy, physically violent, somewhat rare, and impossible to measure directly. But we have learned how to slow collisions down and to measure them in real time. We use lasers to make plasmas with temperatures in the 1-Kelvin range. The collisions that occur here are similar, in a way, to the "good" ones that occur at much higher temperature and density. I will talk about things we can learn in this super low temperature environment and why they are interesting to high energy density plasmas. [Preview Abstract] |
Friday, October 16, 2015 3:41PM - 3:53PM |
E1.00002: Measurements of the Ground-State Polarizabilities of Cs, Rb, and K using Atom Interferometry Maxwell Gregoire, Ivan Hromada, William F. Holmgren, Raisa Trubko, Alexander D. Cronin We measured the ground-state static electric-dipole polarizabilities of Cs, Rb, and K atoms with 0.2{\%} uncertainty using a three-nanograting Mach-Zehnder atom beam interferometer.~ Since thermal Cs atoms have short de Broglie wavelengths, we developed measurement methods that do not require resolved atom diffraction: we used phase choppers to measure atomic beam velocity distributions, and electric field gradients to induce polarizability-dependent phase shifts. Our measurements provide benchmark tests for atomic structure calculations and thus test the underlying theory used to interpret atomic parity non-conservation experiments. [Preview Abstract] |
Friday, October 16, 2015 3:53PM - 4:05PM |
E1.00003: Characterization of a Partially-Stabilized Frequency Comb M. E. Gold Dahl, Scott Bergeson We present measurements of the frequency interval between the Rb and the Cs D2 transitions. This interval is measured using a partially stabilized frequency comb, and the results are used to characterize the comb's accuracy. I will present an overview of the comb, the method we use to stabilize it, and our measurement methods. We measure the 32 THz interval with a precision of 0.15 MHz (4 parts per billion). [Preview Abstract] |
Friday, October 16, 2015 4:05PM - 4:29PM |
E1.00004: Attosecond spectroscopy: Application in study of conical intersections Invited Speaker: Arvinder Sandhu The emergence of attosecond spectroscopy has offered researchers a new experimental tool, which provides unprecedented temporal resolution for the direct measurement and control of electronic processes. Pioneering studies have obtained unique physical insights by taking snapshots of atomic and molecular phenomena on the natural timescale of electrons. Ongoing efforts aim to expand the scope of attosecond XUV research for exploration of complex dynamics in molecules and materials. In this talk I will discuss our recent work on the study of coupled electron-nuclear dynamics, where we probe the coherent evolution of electron hole near a conical intersection of a polyatomic molecule. Such conical intersections serve as nature’s energy funnels in many biochemical processes (e.g. DNA repair, light harvesting etc.). I will show that apart from the sensitive measurements of electronic couplings, we can also use our methods to monitor the evolution of quantum coherence in molecular dynamics. [Preview Abstract] |
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