GB2324875A - Corona discharge ion source for analytical instruments - Google Patents

Corona discharge ion source for analytical instruments

Info

Publication number
GB2324875A
GB2324875A GB9816445A GB9816445A GB2324875A GB 2324875 A GB2324875 A GB 2324875A GB 9816445 A GB9816445 A GB 9816445A GB 9816445 A GB9816445 A GB 9816445A GB 2324875 A GB2324875 A GB 2324875A
Authority
GB
United Kingdom
Prior art keywords
ion mobility
corona discharge
doped
dopant
ionisation source
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB9816445A
Other versions
GB2324875B (en
GB9816445D0 (en
Inventor
Robert Brian Turner
Stephen John Taylor
Alastair Clark
Paul Douglas Arnold
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Smiths Detection Watford Ltd
Original Assignee
Graseby Dynamics Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GBGB9602158.9A external-priority patent/GB9602158D0/en
Application filed by Graseby Dynamics Ltd filed Critical Graseby Dynamics Ltd
Priority to GB9816445A priority Critical patent/GB2324875B/en
Publication of GB9816445D0 publication Critical patent/GB9816445D0/en
Publication of GB2324875A publication Critical patent/GB2324875A/en
Application granted granted Critical
Publication of GB2324875B publication Critical patent/GB2324875B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J49/00—Particle spectrometers or separator tubes
    • H01J49/02—Details
    • H01J49/10—Ion sources; Ion guns
    • H01J49/16—Ion sources; Ion guns using surface ionisation, e.g. field-, thermionic- or photo-emission
    • H01J49/168—Ion sources; Ion guns using surface ionisation, e.g. field-, thermionic- or photo-emission field ionisation, e.g. corona discharge

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Electron Tubes For Measurement (AREA)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)

Abstract

An ion mobility spectrometer comprises an ion mobility cell (10) into which molecules of a sample to be analysed are introduced. The ion mobility cell (10) is doped with ions produced by a corona discharge ionisation source (40). In one mode of operation, the corona discharge ionisation source (40) operates to produce a continual dopant stream, and in a second mode of operation, the corona discharge ionisation source (40) produces dopant ions selectively. In the non-continuous mode of operation, the ion mobility cell (10) may be doped with chemical dopant ions instead, switching between the two dopant regimes being accomplished very rapidly. The ion mobility spectrometer is particularly suitable for the detection of explosive compounds and narcotics, the ion mobility spectrum of explosives doped with ions from the corona discharge ionisation source differing from the ion mobility spectrum of such explosive compounds doped with chemical dopants.
GB9816445A 1996-02-02 1997-01-31 Corona discharge ion source for analytical instruments Expired - Lifetime GB2324875B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9816445A GB2324875B (en) 1996-02-02 1997-01-31 Corona discharge ion source for analytical instruments

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB9602158.9A GB9602158D0 (en) 1996-02-02 1996-02-02 Corona discharge ion sources for analytical instruments
GB9816445A GB2324875B (en) 1996-02-02 1997-01-31 Corona discharge ion source for analytical instruments
PCT/GB1997/000307 WO1997028444A1 (en) 1996-02-02 1997-01-31 Corona discharge ion source for analytical instruments

Publications (3)

Publication Number Publication Date
GB9816445D0 GB9816445D0 (en) 1998-09-23
GB2324875A true GB2324875A (en) 1998-11-04
GB2324875B GB2324875B (en) 2000-06-21

Family

ID=26308588

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9816445A Expired - Lifetime GB2324875B (en) 1996-02-02 1997-01-31 Corona discharge ion source for analytical instruments

Country Status (1)

Country Link
GB (1) GB2324875B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006123107A1 (en) 2005-05-14 2006-11-23 Smiths Detection-Watford Limited Detection systems and dopants
WO2007010261A1 (en) 2005-07-20 2007-01-25 Smiths Detection-Watford Limited Detection systems

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5095206A (en) * 1990-06-01 1992-03-10 Environmental Technologies Group, Inc. Method and apparatus for improving the specificity of an ion mobility spectrometer utillizing sulfur dioxide dopant chemistry
WO1993011554A1 (en) * 1991-12-03 1993-06-10 Graseby Dynamics Limited Corona discharge ionisation source
US5234838A (en) * 1990-04-17 1993-08-10 Environmental Technologies Group, Inc. Ammonia monitor based on ion mobility spectrometry with selective dopant chemistry

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5234838A (en) * 1990-04-17 1993-08-10 Environmental Technologies Group, Inc. Ammonia monitor based on ion mobility spectrometry with selective dopant chemistry
US5095206A (en) * 1990-06-01 1992-03-10 Environmental Technologies Group, Inc. Method and apparatus for improving the specificity of an ion mobility spectrometer utillizing sulfur dioxide dopant chemistry
WO1993011554A1 (en) * 1991-12-03 1993-06-10 Graseby Dynamics Limited Corona discharge ionisation source

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Analytical Chemistry, Vol.56, 1984, pp.1794-7, C. J. PROCTOR"Alternative reagent ions for plasma..." *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006123107A1 (en) 2005-05-14 2006-11-23 Smiths Detection-Watford Limited Detection systems and dopants
WO2007010261A1 (en) 2005-07-20 2007-01-25 Smiths Detection-Watford Limited Detection systems
US7946150B2 (en) 2005-07-20 2011-05-24 Smiths Detection-Watford Limited Detection systems
EP2343545A2 (en) 2005-07-20 2011-07-13 Smiths Group plc Detection systems
US8826720B2 (en) 2005-07-20 2014-09-09 Smiths Detecton—Watford Limited Detection systems

Also Published As

Publication number Publication date
GB2324875B (en) 2000-06-21
GB9816445D0 (en) 1998-09-23

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Legal Events

Date Code Title Description
PE20 Patent expired after termination of 20 years

Expiry date: 20170130