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Photoelectron Spectroscopy in a Strong Magnetic Field

A new photoelectron spectroscopic method is described directed towards the measurement of the photoelectron spectroscopy of trapped ions. An electrostatic retarding field electron velocity analyser incorporating a channel plate multiplier is included with an ion trap in a strong magnetic field. A method is described for combining photoelectron spectroscopic with ion cyclotron resonance experiments to give positive identification of those features in the photoemission associated with double ionization processes of particular mass selected ions. The theoretical form of the retarding field photoelectron curve and its dependence upon β is discussed and preliminary experiments reported which show an abnormality in the angular distribution for argon and xenon.