  Magneto photoluminescence and excitation spectroscopy are used to probe the
excited state spectrum of negatively charged trions in a InGaAs quantum dot. A
single dot optical charging device allows us to selectively prepare specific
few (1e, 2e) electron states and stabilize hot trions against decay via
electron tunnelling from excited orbital states. The spin structure of the
excited state results in the formation of metastable trions with strong optical
activity that are directly observed in luminescence. Excitation spectroscopy is
employed to map the excited singlet and triplet states of the two electron
wavefunction and fine structure splittings are measured for the lowest lying
and excited orbital states. Magneto-optical measurements allow us to compare
the g-factors and diamagnetic response of different trion states.
