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Optical Mass Spectrometry of Cold <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>RaOH</mml:mi><mml:mo>+</mml:mo></mml:msup></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:msub><mml:mi>RaOCH</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mo>+</mml:mo></mml:msup></mml:math>
We present an all-optical mass spectrometry technique to identify trapped ions. The new method uses laser-cooled ions to determine the mass of a cotrapped dark ion with a sub-dalton resolution within a few seconds. We apply the method to identify the first controlled synthesis of cold, trapped RaOH+ and RaOCH3+. …