Search for Time-Variation of the Electron-Proton Mass Ratio (μ) with ...
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Sympa<strong>the</strong>tic Cooling <strong>of</strong> Molecular Ions to ~ 10 mK(already demonstrated in Schiller and Drewsen groups)HD + cooled to 20 mK by Be + (cloud shapes well understood)Bly<strong>the</strong>, Roth, Frohlich, Wenz and Schiller, PRL 95, 183002 (2005):• Cooling is better <strong>with</strong> smaller clouds,down to 2x atomic ion temperature• Crystal can be turned <strong>of</strong>f, unwantedions ejected, <strong>the</strong>n recrystallizedSee also• Drewsen et al <strong>for</strong> MgH +• Schiller et al <strong>for</strong> mass 410 “Alexa Fluor 350”
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