Nebuliser outlet

1. A nebuliser outlet comprising:

an inlet end and an outlet end; and

a first channel and one or more second channels arranged between the inlet end and the outlet end;

a wall arranged between the first channel and the one or more second channels;

wherein the first channel is configured to receive a capillary;

wherein the nebuliser outlet is configured such that gas received by the nebuliser outlet can pass to the outlet end via the one or more second channels;

wherein the nebuliser outlet is a single integrated component; and

wherein the wall is curved so as to provide the first channel with two regions that have a diameter configured for being approximately equal to the diameter of the capillary, for retaining the capillary radially and/or axially, and a greater diameter between the two regions.

2. The nebuliser outlet of claim 1 , wherein the nebuliser outlet is formed using an additive manufacturing process.

3. The nebuliser outlet of claim 1 , wherein the nebuliser outlet is formed using Selective Laser Melting (SLM) or electron-beam additive manufacturing.

4. The nebuliser outlet of claim 1 , wherein the nebuliser outlet is configured such that when a capillary is received by the first channel, gas provided to the nebuliser outlet can pass via the one or more second channels to the outlet end, and can nebulise liquid emitted by the capillary.

5. The nebuliser outlet of claim 1 , wherein the first channel and the one or more second channels converge at a convergence region within the nebuliser outlet; and

wherein the nebuliser outlet is configured such that when a capillary is installed in the first channel, the outlet of the capillary is arranged within or downstream of the convergence region.

6. The nebuliser outlet of claim 1 , wherein the nebuliser outlet comprises an outlet aperture arranged at the outlet end, and wherein the first channel is aligned with the outlet aperture; and

wherein the nebuliser outlet is configured such that when a capillary is received by the first channel, the capillary is retained relative to the outlet aperture by the first channel.

7. The nebuliser outlet of claim 6 , wherein:

the outlet aperture has a first cross sectional area;

at least part of the first channel has a second cross sectional area that is less than the first cross sectional area; and

the nebuliser outlet is configured such that, when the capillary is installed in the nebuliser outlet, the outlet of the capillary is arranged downstream of the part of the first channel that has the second cross sectional area.

8. The nebuliser outlet of claim 1 , wherein the first channel comprises a funnel part arranged at the inlet end.

9. The nebuliser outlet of claim 1 , wherein the one or more second channels comprise an annular channel or a segmented annular channel.

10. The nebuliser outlet of claim 1 , further comprising one or more overhangs or protrusions arranged adjacent to an inlet or inlets to the one or more second channels.

11. A nebuliser comprising:

the nebuliser outlet of claim 1 ; and

said capillary;

wherein the capillary is retained by the first channel.

12. The nebuliser of claim 11 , wherein the nebuliser is configured such that the liquid capillary is removable from the nebuliser outlet.

13. The nebuliser of claim 11 , wherein the nebuliser is configured such that, when the liquid capillary is installed in the nebuliser outlet, the distance between an outlet end of the capillary and the outlet end of the nebuliser outlet is adjustable.

14. The nebuliser of claim 11 , wherein the liquid capillary comprises one or more protrusions configured to interfere with an inner wall of the first channel.

15. An ion source comprising the nebuliser of claim 11 .

16. The ion source of claim 15 , further comprising a voltage source configured to apply a voltage to the liquid capillary.

17. The ion source of claim 15 , wherein the ion source comprises an Electrospray Ionisation (ESI) ion source, a Desorption Electrospray Ionisation (DESI) ion source, a Desorption Electro-Flow Focusing Ionisation (DEFFI) ion source, an impactor ion source, or an Atmospheric Pressure Chemical Ionisation (APCI) ion source.

18. A method of nebulising a liquid, the method comprising providing the nebuliser of claim 11 , supplying liquid to the capillary, and supplying gas to the one or more second channels so as to nebulise the liquid emitted by the capillary.

19. A nebuliser outlet as claimed in claim 1 , wherein the first channel has longitudinally extending notches at the inlet end configured to allow gas received by the nebuliser outlet to pass radially outwards through the notches from the first channel to the one or more second channels.