Ion detector

1. An ion detector comprising:

a surface of a substrate configured to receive one or more ions; and

a detector configured to detect one or more ions by detecting electromagnetic radiation scattered by one or more ions at the surface.

2. The ion detector of claim 1 , wherein the substrate is transparent to the electromagnetic radiation scattered by said one or more ions.

3. The ion detector of claim 1 , further comprising an electromagnetic radiation source configured to illuminate the surface with electromagnetic radiation.

4. The ion detector of claim 1 , wherein the detector is configured to detect one or more ions by detecting an interference pattern caused by one or more ions at the surface.

5. The ion detector of claim 1 , wherein the detector is configured to detect one or more ions by detecting an interference pattern caused by interference of electromagnetic radiation reflected by the substrate and electromagnetic radiation scattered by one or more ions at the surface.

6. The ion detector of claim 1 , wherein the ion detector is configured to detect one or more gas phase ions.

7. An analyser comprising the ion detector of claim 1 .

8. The analyser of claim 7 , wherein the analyser is configured to determine the mass to charge ratio, charge, mass, time of flight, ion mobility and/or collision cross section of one or more ions.

9. The analyser of claim 7 , further comprising a field free or drift region, wherein the surface is arranged at an exit region of the field free or drift region.

10. The analyser of claim 7 , further comprising an ion mobility separator, wherein the surface is arranged at an exit region of the ion mobility separator.

11. An analytical instrument comprising the ion detector of claim 1 .

12. The analytical instrument of claim 11 , further comprising:

a non-destructive mass analyser; and

one or more devices configured to cause one or more ions analysed by the non-destructive mass analyser to be deposited upon the surface.