Method of avoiding space charge saturation effects in an ion trap
AssigneeMicromass UK Limited
InventorsMartin Raymond Green, Jason Lee Wildgoose
Life of this patent
Estimating the term…
Abstract
A mass spectrometer is provided comprising a first ion trap arranged upstream of an analytical second ion trap. The charge capacity of the first ion trap is set at a value such that if all the ions stored within the first ion trap up to the charge capacity limit of the first ion trap are then transferred to the second ion trap, then the analytical performance of the second ion trap is not substantially degraded due to space charge effects.
Claims17
A mass spectrometer comprising:
- a first ion trap arranged and adapted:
- (i) to allow said first ion trap to accumulate ions only up to a first charge capacity, such that if said first charge capacity is exceeded then excess ions emerge or are otherwise ejected from said first ion trap;
- and then
- (ii) to transmit or pass at least some or all ions stored within said first ion trap from said first ion trap.
A method of mass spectrometry conducted with a mass spectrometer including a first ion trap, said method comprising:
- allowing ions to accumulate within said first ion trap only up to a first charge capacity, such that if said first charge capacity is exceeded then excess ions emerge or are otherwise ejected from said first ion trap;
- and then
- transmitting or passing at least some or all ions stored within said first ion trap from said first ion trap.
A mass spectrometer comprising:
- a first ion trap arranged and adapted:
- (i) to allow ions to enter said first ion trap for up to a predetermined period of time, wherein said first ion trap is arranged to have a first charge capacity and wherein said first charge capacity is exceeded during said predetermined period of time and excess ions emerge from or are otherwise ejected from said first ion trap;
- and then
- (ii) to transmit or pass at least some or all ions stored within said first ion trap from said first ion trap.
A method of mass spectrometry conducted with amass spectrometer including a first ion trap, said method comprising:
- allowing ions to enter said first ion trap for up to a predetermined period of time, wherein said first ion trap is arranged to have a first charge capacity and wherein said first charge capacity is exceeded during said predetermined period of time and excess ions emerge from or are otherwise ejected from said first ion trap;
- and then
- transmitting or passing at least some or all ions stored within said first ion trap from said first ion trap.
Dependencies are inferred from the claim text.