Bulletin of the American Physical Society
77th Annual Meeting of the Southeastern Section of the APS
Volume 55, Number 10
Wednesday–Saturday, October 20–23, 2010; Baton Rouge, Louisiana
Session GC: Atomic, Molecular, and Optical Physics |
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Chair: Ken Schafer, Louisiana State University Room: Nicholson Hall 118 |
Friday, October 22, 2010 10:45AM - 10:57AM |
GC.00001: Charge exchange in slow collisions of Si3+ with H D.C. Joseph, B.C. Saha Low energy electron capture from atomic hydrogen by multi-charged ions continues to be of interest and has wide applications including both magnetically confined$^{ }$fusion and astrophysical plasmas. The charge exchange process reported here\textit{, Si}$^{3+} + H$ -- \textit{Si}$^{2+} + H^{+}$ is an important destruction mechanism of Si$^{3+}$ in photo-ionized gas. The soft X-ray emission from comets has been explained by charge transfer of solar wind ions, among them Si$^{3+}$, with neutrals in the cometary gas vapor. The state selective cross sections are evaluated using the semi-classical molecular orbital close coupling (MOCC) [1] methods. Adiabatic potentials and wave functions for a number of low-lying singlet and triplet states are calculated using the MRD-CI package [2]. Details will be presented at the conference.$\backslash $ [1] M. Kimura and N. F. Lane, At. Mol. Opt. Phys \textbf{26}, 79 (1990). [3] R. J. Buenker, ``Current Aspects of Quantum Chemistry'' 1981, Vol \textbf{21}, edited by R. Carbo (Elsevier, Amsterdam) p 17. [Preview Abstract] |
Friday, October 22, 2010 10:57AM - 11:09AM |
GC.00002: Measurement of the fourth O-H overtone absorption cross section in acetic acid using cavity ring-down spectroscopy Solomon Bibilign, Israel Begashaw, Marc M. Fiddler We report the measured absorption cross sections of the fourth vibrational O-H overtone in acetic acid using cavity ring-down spectroscopy. The cross sections enable the calculation of the reaction rate $J$ for O-H overtone initiated reactions, such as dissociation and decarboxylation. The contributions to the acetic acid spectrum from the monomer and dimer have been separated. The absorption of acetic acid monomer peaks at about 615 nm and has a peak cross section of 1.84$\times $10$^{-24}$ cm$^{2}$molecule$^{-1}$. Between 612 and 620 nm, the integrated cross section for the acetic acid monomer is (5.23$\pm $0.73)$\times $10$^{-24}$ cm$^{2}$molecule$^{-1}$nm or (1.38$\pm $0.19)$\times $10$^{-22}$ cm$^{2}$molecule$^{-1}$cm$^{-1}$ [Preview Abstract] |
Friday, October 22, 2010 11:09AM - 11:21AM |
GC.00003: The Terahertz Spectrum of the v5/2v9 Dyad of Nitric Acid Paul Helminger, Douglas T. Petkie, Ivan Medvedev, Frank C. De Lucia Because nitric acid is an important molecular species in the ozone cycle in the upper atmosphere, it has been the subject of many studies in both the infrared and microwave regions of the spectrum. Microwave studies of the rotational spectrum of nitric acid in excited vibration states contribute both to a better understanding of this fundamental molecule and to the construction of accurate spectral maps for remote sensing. Our most recent work on nitric acid includes studies of the terahertz spectrum of the ground state and four lowest-energy excited vibrational states. We have now extended this work to include measurements and analysis of the rotational transitions of the v5/2v9 dyad of nitric acid. This very complex spectrum includes torsional splitting of both states and Fermi and Coriolis type interactions between them. Preliminary results of the assignment and analysis will be reported. [Preview Abstract] |
Friday, October 22, 2010 11:21AM - 11:33AM |
GC.00004: ABSTRACT WITHDRAWN |
Friday, October 22, 2010 11:33AM - 11:45AM |
GC.00005: Generation of vacuum squeezing fields via self-roration in Rb vapor Kebei Jiang, Robinjeet Singh, Petr Anisimov As the first part of our ``Sub-shot noise limited quantum atomic magnetometer'' program, this paper proposes a theoretical method of generating the source for the fore-mentioned magnetometer--vacuum squeezing field induced by self-rotation in Rb vapor. We derives a full quantum mechanical description, in contrast with previous semi-classical work, for such a field-atom system. Finally, considering self-rotation as a classical phenomenon, we explains its relation with vacuum squeezing in detail. [Preview Abstract] |
Friday, October 22, 2010 11:45AM - 11:57AM |
GC.00006: Heisenberg-limited optical interferometry with parity detection Kaushik Seshadreesan, Petr Anisimov, Hwang Lee, Jonathan Dowling We present our theoretical study of the sensitivity and resolution of phase measurement, in a Mach-Zehnder interferometer with coherent light and squeezed vacuum inputs, using parity detection. Mixing coherent light and squeezed vacuum has been previously shown to produce N00N-like states inside the interferometer, which suggests a near Heisenberg-limited phase sensitivity. Our results comply with the above observation at high photon numbers. Given a recently shown implementation of parity detection using homodyne detection, we propose an experiment for phase super-sensitivity with high photon flux. [Preview Abstract] |
Friday, October 22, 2010 11:57AM - 12:09PM |
GC.00007: Vortices in Dipole Radiation Near a Mirror Xin Li, Henk Arnoldus The emission of radiation by a linearly oscillating electric dipole is drastically altered when the dipole is close to the surface of a mirror. The energy is not emitted along optical rays, as for a free dipole, but as a set of four optical vortices. The field lines of energy flow spiral around a set of two lines through the dipole. At a larger distance from the dipole singularities and isolated vortices appear. It is shown that these interference vortices are due to the vanishing of the magnetic field at their centers. In the plane of the mirror there is a singular circle with a diameter which is proportional to the distance between the dipole and the mirror. Inside this circle, all energy flows to a singularity on the mirror surface. [Preview Abstract] |
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