Apparatus for reduction of selected ion intensities in confined ion beams
AssigneeBattelle Memorial Institute
InventorsGregory C. Eiden, Charles J. Barinaga, David W. Koppenaal
Life of this patent
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Abstract
An apparatus for producing an ion beam having an increased proportion of analyte ions compared to carrier gas ions is disclosed. Specifically, the apparatus has an ion trap or a collision cell containing a reagent gas wherein the reagent gas accepts charge from the analyte ions thereby selectively neutralizing the carrier gas ions. Also disclosed is the collision cell as employed in various locations within analytical instruments including an inductively coupled plasma mass spectrometer.
Claims22
An apparatus for providing an ion beam in a system where a mixture of carrier gas ions and analyte ions is provided, the apparatus comprising:
- (a) an ion source;
- coupled with
- (b) a collision cell containing a reagent gas comprising hydrogen wherein said mixture is introduced selectively transferring charge from the carrier gas ions to the reagent gas, thereby neutralizing the carrier gas ions and forming a charged reagent gas.
In an inductively coupled plasma mass spectrometer having an analyte gas and a carrier gas as a mixture, the improvement comprising:
- (a) a collision cell containing a reagent gas comprising hydrogen between a first aperture and a mass analyzer wherein said mixture is introduced and selectively transferring charge from carrier gas ions and/or matrix ions to the reagent gas to form charged reagent gas.
An apparatus for providing an ion beam in a system where a mixture of carrier gas ions and analyte ions is provided, the apparatus comprising:
- (a) an ion source;
- coupled with
- (b) an ion trap containing a reagent gas comprising hydrogen wherein said mixture is introduced selectively transferring charge from the carrier gas ions to the reagent gas, thereby neutralizing the carrier gas ions and forming a charged reagent gas.
An apparatus for providing an ion beam in a system where a mixture of carrier gas ions and analyte ions is provided, the apparatus comprising:
- (a) an ion source;
- coupled with
- (b) an ion trap containing a reagent gas wherein the reagent gas has a lower molecular weight than that of the carrier gas, and wherein said mixture is introduced selectively transferring charge from the carrier gas ions to the reagent gas, thereby neutralizing the carrier gas ions and forming a charged reagent gas.
An apparatus for providing an ion beam in a system where a mixture of carrier gas ions and analyte ions is provided, the apparatus comprising:
- (a) an ion source;
- coupled with
- (b) a collision cell containing a reagent gas wherein the reagent gas has a lower molecular weight than that of the carrier gas, and wherein said mixture is introduced selectively transferring charge from the carrier gas ions to the reagent gas, thereby neutralizing the carrier gas ions and forming a charged reagent gas.
Dependencies are inferred from the claim text.