| CPC H01J 49/0404 (2013.01) [H01J 49/0431 (2013.01); H01J 49/0459 (2013.01)] | 15 Claims |

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1. A nozzle for directing heated gas onto the distal end of a capillary arrangeable adjacent the nozzle, the nozzle comprising:
a housing defining a plenum for heated gas; and
at outlet comprising at least one aperture fluidly connected to the plenum, the outlet configured to direct a curtain of the heated gas onto the distal end of a capillary in use, such that the plane of the curtain of heated gas is substantially aligned with the longitudinal axis of the capillary.
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