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AMS Users Community
Annual Meeting Attendance
680+ Published Articles to date
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Overview of Aerosol Instrument
Developments
AMS Family and Aerosol Collectors
TAG and FIGAERO
Sat 9:19 AM
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Instruments and Developments
AMS, mini AMS
QACSM, ToF ACSM
CIMS and Aerosol CIMS
IMS TOF
LAAPTOF
TAG AMS
Capture Vaporizer
Particle Lens
ePTOF Multiplex chopper
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Something we may have delivered to the
Manchester Group!
s/n: 255-002
June 2000
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The Quad AMS
Zhang et al, GRL 2007
The work horse
Where the fundamental
hardware and software ideas
evolved.
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QAMS 1995 – 2000+
CTOF AMS 2001
HTOF AMS 2002
QACSM 2004 – 2009+
SP HTOF AMS 2007
eTOF ACSM 2010
CTOF mAMS 2011
HTOF mAMS TBD
Geneology and Chronology of
AMS systems
Different colors are different vacuum systems
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If it has a chopper its an AMS
-can do pTOF sizing
If it doesn’t have a chopper its an ACSM
-no pTOF sizing, mass spectra only
A mini-AMS is just a smaller AMS
-a different vacuum system
What’s the Difference between an
AMS, mini-AMS and an ACSM
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All AMS and ACSM Systems Share
a Few Common Features
• Particle aerodynamic lens
• A differentially pumped high vacuum
system, efficient gas-particle separation
• Particle vaporizer
• Electron impact ionization source
• Mass spectrometer ► performance/Cost
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Research grade
TOF mass spectrometer
Thermal
Vaporization
&
Electron
Impact
Ionization
Aerodynamic
Lens
Beam
Chopper
Particle TOF Region
Particle Beam
Generation
Aerodynamic
Sizing
Particle
Composition
Aerosol Mass Spectrometer
Pumps (x5)
Fast Data
System
Timers
DACs
Full PC
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Particle Inlet (1 atm)
Thermal
Vaporization
&
Electron
Impact
Ionization
Aerodynamic Lens
40-1000 nm
Particle Beam
Generation
Particle
Composition
Aerosol Chemical Speciation Monitor
Laptop
Computer
Pumps (x3)
No Sizing
Smaller/lower cost
Q- or TOF- Mass Spec
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QACSM
discrete turbos
TOF ACSM and mAMS
Split flow turbo
Two Different Vacuum System Designs
Pumping speeds (L/s)
300 80 300 40 170 135 160
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Key Difference Between the mAMS/ACSM
and AMS Systems is Pumping at the First
Stage
Reduced particle transmission at small size end
Operating pressure range
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eTOF ACSM cTOF mAMS
Recent mAMS and ACSM Systems
Differences between ACSM and mAMS
are the chopper and the DAQ system
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The new TOF ACSM and
mAMS systems have a new
generation of electronics
and TPS systems.
• Giraffe
• TPS2
Is this the next generation
AMS system?
Size: 23”H x 25”W x 19”D
Weight: 160 pounds
Power: ~300W
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28.2” (720 mm)
31.4” (800 mm)
Overall length
Can we put a mini-Vacuum system on an HTOF?
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Some Open Issues to be Addressed with mAMS
System
• Software development of AMS DAQ system
Different sw paths to support AP240, ADQ1600, TPS 1&2, Giraffe,
different analog and digital I/O systems.
• Performance Evaluations
Particle transmission, reduced pumping speed at lens exit leads to
collisional defocusing of sub 100 nm particles.
Shorter pTOF flight path, is the trade off with size resolution
acceptable.
• Vacuum chamber compatibility for optional modules
mini-chamber does not currently support light scattering, soot particle
laser module, beam width probe. Use with HTOF mass spectrometer.
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Aerosol composition with the CIMS
instrument
Particle collection and thermal vaporization
MOVI - obsolete. Aerosol collection by
impaction. Complications with particle and
sticky gas wall interactions.
FIGAERO – new collector module. Aerosol
collection by filtration. Separate sampling
lines for gas and aerosol
EyeOn - A hardware and software control
system for the collector module
Nozzle Tube
Pump
210Po source
Ion-Molecule
Region (IMR)CIMS
Impactor tube
Cartridge heater
Orifice
Inlet 1
2
Brass impaction
surface, 3
4
CH3I/N2
TC
UW - Joel Thornton, Claudia, Felipe
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September 4, 2010 18
TAG-AMS Thermal Desorption Aerosol GC/MS
Williams et al. 2006 (UCB)
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TAG-CIMS
GC Interface kept at 250C
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TAG Module
Thorsten Hohaus