Measurement of asymmetric optical pumping of ions accelerating in a magnetic-field gradient |
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Authors: | Sun Xuan Scime Earl Miah Mahmood Cohen Samuel Skiff Frederick |
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Institution: | Department of Physics, West Virginia University, Morgantown, WV 26506, USA. |
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Abstract: | We report observations of asymmetric optical pumping of argon ions accelerating in a magnetic-field gradient. The signature is a difference in the laser-induced-fluorescence emission amplitude from a pair of Zeeman-split states. A model that reproduces the dependence of the asymmetry on magnetic-field and ion-velocity gradients is described. With the model, the fluorescence intensity ratio provides a new method of measuring ion collisionality. This phenomenon has implications for interpreting stellar plasma spectroscopy data which often exhibit unequal Zeeman state intensities. |
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