Systems and methods for ejection of ions from an ion trap

Patent metadata

Field	Value
Publication number	US-9922813-B2
Application number	US-201715421934-A
Country	US
Kind code	B2
Filing date	Feb 1, 2017
Priority date	Feb 1, 2016
Publication date	Mar 20, 2018
Grant date	Mar 20, 2018

Abstract

The invention generally relates to systems and methods for ejection of ions from an ion trap. In certain embodiments, systems and methods of the invention sum two different frequency signals into a single summed signal that is applied to an ion trap. In other embodiments, an amplitude of a single frequency signal is modulated as the single frequency signal is being applied to the ion trap. In other embodiments, a first alternating current (AC) signal is applied to an ion trap that varies as a function of time, while a constant radio frequency (RF) signal is applied to the ion trap.

First claim

What is claimed is:

1. A system, the system comprising:
a mass spectrometer comprising an ion trap; and
a central processing unit (CPU), and storage coupled to the CPU for storing instructions that when executed by the CPU cause the system to:
generate a first frequency signal and a second frequency signal, wherein the first frequency signal is an arbitrary frequency ω and the second frequency signal is a lower trapping sideband Ω rf−ω; or the first frequency signal is an arbitrary frequency 2ω and the second frequency signal is a lower trapping sideband Ωrf−2ω, or the first frequency signal is an arbitrary frequency 3ω and the second frequency signal is a lower trapping sideband Ωrf−3ω; or the first frequency signal is an arbitrary frequency ω that corresponds to a higher order resonance associated with the structure of the ion trap, and the second frequency signal is a lower trapping sideband that corresponds to Ωrf+/−ω;
sum the first and second frequency signals to produce a single summed frequency signal; and
apply the single summed frequency signal to the ion trap.

2. The system according to claim 1 , wherein the first frequency signal is an alternating current (AC) signal, and the second frequency signal is radio frequency (RF) signal that varies as a function of time.

3. The system according to claim 1 , wherein the instructions that when executed by the CPU further cause the system to: apply a third frequency to the ion trap.

4. The system according to claim 1 , wherein the ion trap is selected from the group consisting of: a hyperbolic ion trap, a cylindrical ion trap, a linear ion trap, a rectilinear ion trap.

5. The system according to claim 1 , wherein the mass spectrometer is a miniature mass spectrometer.

6. The system according to claim 1 , further comprising an ionization source.

Assignees

• Purdue Research Foundation

Inventors

• Cooks Robert Graham
• Snyder Dalton

Classifications

• H01J49/4225

  Multipole linear ion traps, e.g. quadrupoles, hexapoles · CPC title

• H01J49/4285 Primary

  Applying a resonant signal, e.g. selective resonant ejection matching the secular frequency of ions (H01J49/429, H01J49/428 take precedence) · CPC title

• H01J49/0013

  Miniaturised spectrometers, e.g. having smaller than usual scale, integrated conventional components · CPC title