| 摘要 |
<p>A time of flight mass analyzer is disclosed comprising a device arranged to apply a DC voltage pulse to one or more electrodes so as to cause ions to be accelerated into a TOF or drift region, said DC pulse being applied to said electrodes between times T1 and T2. A second device is arranged to apply a single phase oscillating voltage to said electrodes which undergoes multiple oscillations between times T1 and T2, and preferably comprises a sinusoidal, sawtooth or triangular waveform. The application of the DC pulse and oscillating voltage to said electrodes establishes a homogeneous electric field having a net force towards the drift region. The oscillating voltage also causes ions to experience a spatially correlated energy deviation so as to reduce second or higher order spatial focusing aberrations. Alternatively, said aberrations may be reduced by applying an oscillating voltage to one or more electrodes in said TOF or drift region.</p> |
