Výsledky vyhledávání - "Simien, C. E."

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Quantum interference and light polarization effects in unresolvable atomic lines: application to a precise measurement of the 6,7 Li D2 lines

Autor: Brown, Roger C., Wu, Saijun, Porto, J. V., Sansonetti, Craig J., Simien, C. E., Brewer, Samuel M., Tan, Joseph N., Gillaspy, J. D.

Publikováno v: Phys. Rev. A 87, 032504 (2013)

We characterize the effect of quantum interference on the line shapes and measured line positions in atomic spectra. These effects, which occur when the excited state splittings are of order the excited state line widths, represent an overlooked but

Externí odkaz: http://arxiv.org/abs/1212.2220

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Electron Temperature Evolution in Expanding Ultracold Neutral Plasmas

Autor: Gupta, P., Laha, S., Simien, C. E., Gao, H., Castro, J., Pohl, T., Killian, T. C.

We have used the free expansion of ultracold neutral plasmas as a time-resolved probe of electron temperature. A combination of experimental measurements of the ion expansion velocity and numerical simulations characterize the crossover from an elast

Externí odkaz: http://arxiv.org/abs/0705.3416

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Experimental Realization of an Exact Solution to the Vlasov Equations for an Expanding Plasma

Autor: Laha, S., Gupta, P., Simien, C. E., Gao, H., Castro, J., Pohl, T., Killian, T. C.

We study the expansion of ultracold neutral plasmas in the regime in which inelastic collisions are negligible. The plasma expands due to the thermal pressure of the electrons, and for an initial spherically symmetric Gaussian density profle, the exp

Externí odkaz: http://arxiv.org/abs/0705.3056

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Ultracold Neutral Plasmas

Autor: Killian, Thomas C., Chen, Y. C., Gupta, P., Laha, S., Martinez, Y. N., Mickelson, P. G., Nagel, S. B., Saenz, A. D., Simien, C. E.

Ultracold neutral plasmas are formed by photoionizing laser-cooled atoms near the ionization threshold. Through the application of atomic physics techniques and diagnostics, these experiments stretch the boundaries of traditional neutral plasma physi

Externí odkaz: http://arxiv.org/abs/physics/0410019

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Absorption Imaging and Spectroscopy of Ultracold Neutral Plasmas

Autor: Killian, T. C., Chen, Y. C., Gupta, P., Laha, S., Martinez, Y. N., Mickelson, P. G., Nagel, S. B., Saenz, A. D., Simien, C. E.

Absorption imaging and spectroscopy can probe the dynamics of an ultracold neutral plasma during the first few microseconds after its creation. Quantitative analysis of the data, however, is complicated by the inhomogeneous density distribution, expa

Externí odkaz: http://arxiv.org/abs/physics/0407138

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Using Absorption Imaging to Study Ion Dynamics in an Ultracold Neutral Plasma

Autor: Simien, C. E., Chen, Y. C., Gupta, P., Laha, S., Martinez, Y. N., Mickelson, P. G., Nagel, S. B., Killian, T. C.

We report optical absorption imaging of ultracold neutral plasmas.Images are used to measure the ion absorption spectrum, which is Doppler-broadened. Through the spectral width, we monitor ion equilibration in the first 250ns after plasma formation.

Externí odkaz: http://arxiv.org/abs/physics/0310017

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Magnetic trapping of metastable $^3P_2$ atomic strontium

Autor: Nagel, S. B., Simien, C. E., Laha, S., Gupta, P., Ashoka, V. S., Killian, T. C.

We report the magnetic trapping of metastable $^3P_2$ atomic strontium. Atoms are cooled in a magneto-optical trap (MOT) operating on the dipole allowed $^1S_0-^1P_1$ transition at 461 nm. Decay via $^1P_1\to {^1D_2}\to {^3P_2}$ continuously loads a

Externí odkaz: http://arxiv.org/abs/physics/0212024

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