Ion flow guide devices and methods
Certain configurations of devices are described herein that include DC multipoles that are effective to direct ions. In some instances, the devices include a first multipole configured to provide a DC electric field effective to direct first ions of an entering particle beam along a first exit trajectory that is substantially orthogonal to an entry trajectory of the particle beam. The devices may also include a second multipole configured to provide a DC electric field effective to direct the received first ions from the first multipole along a second exit trajectory that is substantially orthogonal to the first exit trajectory.
1. A method comprising:
deflecting ions of a particle beam comprising ions of interest, photons and neutrals that enter a first direct current multipole along an exit trajectory, in which the exit trajectory is substantially orthogonal to an entry trajectory of the particle beam; and
deflecting the ions of interest along the exit trajectory using a second direct current multipole fluidically coupled to the first direct current multipole, wherein the second direct current multipole comprises an entrance aperture fluidically coupled to an exit aperture of the first multipole, wherein the entrance aperture of the second direct current multipole receives the ions of interest, photons and neutrals along the exit trajectory from the first direct current multipole through the exit aperture of the first direct current multipole, in which the second direct current multipole is configured to deflect the received ions of interest along a third trajectory that is substantially orthogonal to the exit trajectory to separate the received ions of interest from the received photons and the received neutrals along the exit trajectory, wherein the first direct current multipole and the second direct multipole are present in a housing of an ion flow guide, and the wherein the deflected ions of interest along the third trajectory exit the housing of the ion flow guide as an ion beam.
2. The method of claim 1 , further comprising configuring each of the first direct current multipole and the second direct current multipole with a DC electric field to deflect the ions, and wherein the ions of interest are deflected along the third trajectory in the absence of any radio frequencies applied to electrodes of the first direct current multipole and to electrodes of the second direct current multipole.
3. The method of claim 1 , further comprising configuring the second direct current multipole to deflect the ions of interest along the third trajectory in a direction that is substantially antiparallel to a direction of the entry trajectory.
4. The method of claim 1 , further comprising configuring the second direct current multipole to deflect the ions of interest along the third trajectory in a direction that is substantially parallel to a direction of the entry trajectory.
5. The method of claim 1 , further comprising focusing the ions of interest exiting along the third trajectory using at least one lens.
6. The method of claim 1 , further comprising focusing the ions of interest entering an entry aperture of the first direct current multipole using a set of electrodes.
7. The method of claim 1 , further comprising at least one flanking electrode positioned between the exit aperture of the first direct current multipole and the entrance aperture of the second direct current multipole.
8. The method of claim 7 , comprising providing a DC potential of between −50 Volts and 0 Volts to the at least one flanking electrode.
9. The method of claim 7 , comprising providing a DC potential of between −35 Volts and −10 Volts to the at least one flanking electrode.
10. The method of claim 7 , wherein the at least one flanking electrode is configured as a plate electrode.
11. The method of claim 7 , further comprising focusing ions exiting along the third trajectory using at least one lens.
12. The method of claim 11 , wherein the lens comprises two plate electrodes.
13. A method comprising:
deflecting ions of a particle beam that enter a first multipole along an exit trajectory, in which the exit trajectory is substantially orthogonal to an entry trajectory of the particle beam;
deflecting ions along the exit trajectory using a second multipole fluidically coupled to the first multipole, in which the second multipole is configured to deflect the exit trajectory ions along a third trajectory that is substantially orthogonal to the exit trajectory; and
deflecting ions along the third trajectory of the second multipole using a third multipole fluidically coupled to the second multipole, in which the third multipole is configured to deflect the third trajectory ions along a fourth trajectory that is substantially orthogonal to the third trajectory.
14. A method comprising:
deflecting ions of a particle beam that enter a first multipole along an exit trajectory, in which the exit trajectory is substantially orthogonal to an entry trajectory of the particle beam;
deflecting ions along the exit trajectory using a second multipole fluidically coupled to the first multipole, in which the second multipole is configured to deflect the exit trajectory ions along a third trajectory that is substantially orthogonal to the exit trajectory; and
deflecting second ions of the particle beam that enter the first multipole along an additional exit trajectory, in which the additional exit trajectory is substantially orthogonal to an entry trajectory of the particle beam, and in which the second ions of the particle beam are of opposite charge to the ions of the particle beam.
15. The method of claim 14 , further comprising a lens adjacent to an exit aperture where the second ions along the additional exit trajectory exit.
16. The method of claim 15 , further comprising deflecting the ions along the exit trajectory using at least one flanking electrode.