  A new scheme is proposed for rotations of a double-donor charge qubit whose
logical states are defined by the two lowest energy states of a single electron
localized around one or another donor. It is shown that making use of the
microwave pulses tuned to the resonance with an auxiliary excited molecular
level allows for implementation of various one-qubit operations in very short
times. Decoherence effects are analyzed by the example of the P$_2^+$:Si system
and shown to be weak enough for experimental realization of this scheme being
possible.
