Tapered or tilted electrodes to allow the superposition of independently controllable DC field gradients to RF fields
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 19, 2000
Grant Date -
N/A
app pub date -
Mar 12, 1997
filing date -
Mar 12, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The present invention is embodied in a method and apparatus for transporting ions via a path generated by RF electrodes having a controllable DC field gradient generated thereon which does not suffer from mass discrimination. In a preferred embodiment, the number of electrodes are doubled to thereby use symmetry to cancel an undesirable DC quadrapole field. By eliminating the DC quadrapole field, the passband of the DC field gradient is increased, allowing for ions of higher mass to be transported. The electrodes are either tilted or tapered to thereby generate the desirable DC field gradient. Tilting and/or tapering the electrodes advantageously modifies the DC field gradient to increase the high ion mass cut-off.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully