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Electrospray ionization interface to high pressure mass spectrometry and related methods

專(zhuān)利號(hào)
US10867781B2
公開(kāi)日期
2020-12-15
申請(qǐng)人
The University of North Carolina at Chapel Hill（US NC Chapel Hill）
發(fā)明人
John Michael Ramsey; William McKay Gilliland, Jr.
IPC分類(lèi)
H01J49/16; H01J49/24; H01J49/00; H01J49/04; B01L3/00
技術(shù)領(lǐng)域
mass,esi,analyzer,about,mm,inlet,chamber,ion,vacuum,trap
地域： NC NC Chapel Hill

摘要

An electrospray ionization (ESI)-mass spectrometer analysis systems include an ESI device with at least one emitter configured to electrospray ions and a mass spectrometer in fluid communication with the at least one emitter of the ESI device. The mass spectrometer includes a mass analyzer held in a vacuum chamber. The vacuum chamber is configured to have a high (background/gas) pressure of about 50 mTorr or greater during operation. During operation, the ESI device is configured to either; (a) electrospray ions into a spatial region external to the vacuum chamber and at atmospheric pressure, the spatial extent being adjacent to an inlet device attached to the vacuum chamber, the inlet device intakes the electrosprayed ions external to the vacuum chamber with the mass analyzer and discharges the ions into the vacuum chamber with the mass analyzer; or (b) electrospray ions directly into the vacuum chamber with the mass analyzer.

說(shuō)明書(shū)

The pump(s) 70 can be any suitable pump, typically small, light weight pumps. Examples of pumps include, for example only, a TPS Bench (SH110 and Turbo-V 81 M pumps) compact pumping system and/or a TPS compact (IDP-3 and TurboV 81M pumps) pumping system from Agilent Technologies, Santa Clara, Calif. Operational pressures at or above 50 mTorr can be easily achieved by mechanical displacement pumps such as rotary vane pumps, reciprocating piston pumps, or scroll pumps.

FIGS. 4A-4D, 9A and 10B illustrate that the detector 40 can comprise a Faraday cup detector 40C in communication with an amplifier such as a differential amplifier (908 Devices, Boston, Mass.). The ions signal can be collected on a Faraday cup detector 40C and amplified by an amplifier 92 (FIG. 10B). One example of an amplifier 92 is aA250CF CoolFET? Charge Sensitive Preamplifier from Amptek Inc. Other detector configurations and other amplifiers may be used.

Ions can be accumulated for a defined time for a respective scan, such as between about 1-30 milliseconds, typically between about 1-10 milliseconds, before analysis, in some embodiments. Successive scans can be averaged for each analysis, typically between 20-1000 individual scans.

權(quán)利要求

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