METHOD OF OPERATING TANDEM ION TRAPS
First Claim
1. A method of operating a mass spectrometer system having a first ion trap and a second ion trap, the method comprising:
- a) accumulating ions in the first ion trap at a first time;
b) transmitting a first plurality of ions out of the first ion trap through a timed-ion selector;
c) applying a pulsed DC voltage to the timed-ion selector for deflecting a first group of unwanted ions from the first plurality of ions, leaving a first portion of selected ions having masses within a first mass range;
d) transmitting the first portion of selected ions out of the timed-ion selector and into the second ion trap at a second time;
e) retaining a second plurality of ions in the first ion trap at the second time, the second plurality of ions having masses within a second mass range different from the first mass range;
f) transmitting the first portion of selected ions out of the second ion trap at a third time; and
,g) transmitting the second plurality of ions out of the first ion trap through a timed-ion selector;
h) applying a pulsed DC voltage to the timed-ion selector for deflecting a second group of unwanted ions from the second plurality of ions, leaving a second portion of selected ions having masses within a second mass range;
i) transmitting a second portion of selected ions out of the timed-ion selector and into the second ion trap at a fourth time; and
j) transmitting the second portion of selected ions out of the second trap.
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Abstract
A method for operating tandem ion traps is provided, involving a) accumulating ions in the first ion trap at a first time; b) transmitting a first plurality of ions out of the first ion trap and into the second ion trap at a second time, the first plurality of ions having masses within a first mass range; c) retaining a second plurality of ions in the first ion trap at the second time, the second plurality of ions having masses within a second mass range different from the first mass range; d) transmitting the first plurality of ions out of the second ion trap at a third time; and, e) transmitting the second plurality of ions out of the first ion trap and into the second ion trap at the third time.
25 Citations
16 Claims
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1. A method of operating a mass spectrometer system having a first ion trap and a second ion trap, the method comprising:
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a) accumulating ions in the first ion trap at a first time; b) transmitting a first plurality of ions out of the first ion trap through a timed-ion selector; c) applying a pulsed DC voltage to the timed-ion selector for deflecting a first group of unwanted ions from the first plurality of ions, leaving a first portion of selected ions having masses within a first mass range; d) transmitting the first portion of selected ions out of the timed-ion selector and into the second ion trap at a second time; e) retaining a second plurality of ions in the first ion trap at the second time, the second plurality of ions having masses within a second mass range different from the first mass range; f) transmitting the first portion of selected ions out of the second ion trap at a third time; and
,g) transmitting the second plurality of ions out of the first ion trap through a timed-ion selector; h) applying a pulsed DC voltage to the timed-ion selector for deflecting a second group of unwanted ions from the second plurality of ions, leaving a second portion of selected ions having masses within a second mass range; i) transmitting a second portion of selected ions out of the timed-ion selector and into the second ion trap at a fourth time; and j) transmitting the second portion of selected ions out of the second trap. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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- 16. The method as defined in claim 16 wherein the variable operating mass range is less than a tenth of the starting mass range.
Specification