Photoabsorption and Magneto-Optical Spectroscopy of Mass-Selected Atomic and Cluster Ions Stored in an Ion Trap

摘要

A novel experimental technique is presented for optical absorption spectroscopy, magneto-optics (Zeeman and Faraday effects), and spin polarization of free atomic and cluster ions. In this technique, mass-selected ions stored in an ion trap are interrogated by photons trapped in a cavity. The storage lifetime of photons in the cavity provides extremely high sensitivity in absorption and polarization-rotation measurements (photon-trap spectroscopy: an extended scheme of cavity ring-down spectroscopy). The atomic ion of manganese (Mn~+) and a silver cluster ion (Ag_9~+) are studied including the effects of temperature and magnetic field.