Bulletin of the American Physical Society
2007 Ohio Section of the APS Spring Meeting
Volume 52, Number 5
Friday–Saturday, May 4–5, 2007; Ypsilanti, Michigan
Session D1: Atomic, Molecular, and Optical Physics |
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Chair: Natthi Sharma, Eastern Michigan University Room: EMU Student Center 310A |
Saturday, May 5, 2007 9:12AM - 9:24AM |
D1.00001: Classical Ensemble Studies of Strong-Field Double Ionization of Atoms Zach Smith, S.L. Haan Non-Sequential Double Ionization of atoms by strong laser fields is very complicated, but is amenable to classical description. We will review our three-dimensional classical-ensemble studies of double ionization, and show the semi-quantitative agreement with experimental results. We find that the double ionization typically proceeds through a sequence of events--single ionization followed by recollision excitation, with over-the-barrier ionization occuring a portion of a laser cycle later. We consider laser wavelengths 780 nm and 390 nm. [Preview Abstract] |
Saturday, May 5, 2007 9:24AM - 9:36AM |
D1.00002: Measurement of disorientation cross section in the $^{133}$Cs $6p^{2}P_{3/2}$ level by circular polarization spectra Burcin Bayram, Ramesh Marhatta, Matthew Briel, Prakash Koirala A measurement of the circular polarization degree of the $6s^{2}S_{1/2}\rightarrow6p^{2}P_{3/2}\rightarrow10s^{2}S_{1/2}$ transition in atomic $^{133}$Cs has been made. The spectra is dependent on both alignment and orientation created by a circularly polarized light in the $6p^{2}P_{3/2}$ level of cesium. The cross section for disorientation of optically oriented $6p^{2}P_{3/2}$ cesium atoms, induced in collisions with argon noble gases have been extracted from the two-photon double-resonance circular polarization spectra. Experimental details and the results will be presented. [Preview Abstract] |
Saturday, May 5, 2007 9:36AM - 9:48AM |
D1.00003: Revealing Hidden Time Dependence Using Polarized Light in Photothermal Studies Daeha Joung, Marshall Thomsen, Donald Snyder A study of polymer properties was conducted by photothermal methods. As a pump beam irradiates a sample, some of the optical energy is converted to thermal energy. This conversion of energy produces localized deformation of the surface, a thermal bump, due to thermal expansion. The characteristics of a thermal bump depend on thermal, optical, and mechanical properties of the sample. The bump is detected by a weaker probe beam. The bump changes the nature of the reflected probe beam, allowing us to observe physical changes of the sample. By using a polarized probe beam, we have observed that changes in the reflected beam are dependent on polarization. The resulting time dependence has not been observed in the absence of polarized light. A comparison of results using polarized light and non-polarized light can provide new insight into changes in structures of polymers. [Preview Abstract] |
Saturday, May 5, 2007 9:48AM - 10:00AM |
D1.00004: Magnetic Dipole Scattering of Polarized Light from Nanoparticle Suspensions Natthi L. Sharma, Ernest R. Behringer, Rene C. Crombez Scattering induced by the magnetic field of polarized light has been identified for the first time using nanoparticle scatterers and a transverse scattering geometry. Apart from the dominant electric dipole scattering, we find a fraction (up to $\sim $10{\%}) of scattered light with an angular distribution and polarization that match those of magnetic dipole radiation produced by the oscillatory magnetization of nano-scatterers driven by the often inconsequential (in the case of molecular scattering) magnetic field of the incident light. This latter radiation cannot be explained by impurity of laser polarization, optical anisotropy of scatterers, multiple scattering, and optical activity. [Preview Abstract] |
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