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ACSM Advances
CACC Folks
Phil Croteau
January 20, 2021 Virtual AMS Users Meeting 2021 1
Outline
• TOF-ACSM Software
• Q-ACSM Mass Spec News
• Calibration kit work
• TOF-ACSM X
• “Answers” to submitted questions
January 20, 2021 Virtual AMS Users Meeting 2021 2
excluded from average
Acquility v2.3.9+
Moved from “Fast Switching” to “Time Resolved Evaporation”
Cube averaging for TRE mode enables manageable file size.
January 20, 2021 Virtual AMS Users Meeting 2021 3
Tofware 3
Leah will hold tutorial on Friday AM
Workflow 1
Workflow 2Divide analysis tasks into two “workflows”
1. Generate ‘diff stick’ mass spectra
2. Do AMS/ACSM analysis (species, etc.)January 20, 2021 Virtual AMS Users Meeting 2021 4
Q-ACSM – Pfeiffer will stop producing PrismaPlus and move to new PrismaPro
• Prototype PrimsaPro ACSM built up
• New electronics design in testing
• DAQ software in process
• Initial data look similar to PrismaPlus
• More analog and digital I/O
January 20, 2021 Virtual AMS Users Meeting 2021 5
Calibration kit development
Atomizer
Water trap
Dryer
DMA
CPC
ACSM
exhaust
Sample Pump
exhaust
ambient
ACSM filter-switching
• Switch between calibration and ambient (ACSM + SMPS) mode
• Ben Nault working on evaluation and prototype
January 20, 2021 Virtual AMS Users Meeting 2021 6
Compact kit via Aerosol Dynamics3D printed design via Dan Cziczo
Particle Counting – Aerosol Dynamics MAGIC CPC
January 20, 2021 Virtual AMS Users Meeting 2021 7
Moderated Aerosol Growth with Internal water Cycling
• Compact
• Water-based
• Ambient humidity is often enough water (no reservoir needed)
MAGIC compares well with a calibrated TSI 3776
January 20, 2021 Virtual AMS Users Meeting 2021 8
Ben Nault’s data
Particle size selection – Spider DMAStavros Amanatidis (CalTech) and Susanne Hering (ADI)
January 20, 2021 Virtual AMS Users Meeting 2021 9
Spider DMA Transfer Function
January 20, 2021 Virtual AMS Users Meeting 2021 10
Resolution ~3Dp max ~500nm
January 20, 2021 Virtual AMS Users Meeting 2021 11
300 nm NH4NO3
measured with AMS
from Spider and TSI DMAs
MAGIC Spider Measured Cooking Aerosol
January 20, 2021 Virtual AMS Users Meeting 2021 12
January 20, 2021 Virtual AMS Users Meeting 2021 13
Q-ACSM Calibration comparing
TSI and Spider DMA
TOF-ACSM X
• Same footprint as TOF-ACSM• FTOF mass spectrometer
• Simplified/more robust HTOF• Resolution ~2000 m/dm• Same data system as TOF-ACSM• Can provide
• Explicit H:C, O:C• Improved NH4 with HR fitting
• ARI got this as Christmas present• Characterizing in lab now
January 20, 2021 Virtual AMS Users Meeting 2021 14
January 20, 2021 Virtual AMS Users Meeting 2021 15
TOF-ACSM XResolution
(first measurements) No Vaporizer~2100 m/dm
With Vaporizer~1820 m/dm
Very quick tune done after vaporizer install – definitely room for
improvement
High resolution enables improved NH4
quantification
January 20, 2021 Virtual AMS Users Meeting 2021 16
January 20, 2021 Virtual AMS Users Meeting 2021 17
High resolution enables improved NH4
quantification
Don’t believe absolute scale (analysis needs work) – just compare S/N
Sample HR Fits at m/z 43, 57
January 20, 2021 Virtual AMS Users Meeting 2021 18
Average Org Mass Spec
January 20, 2021 Virtual AMS Users Meeting 2021 19
Average*H:C = 1.52O:C = 0.45
*Not sure I’ve got calculation quite right yet
Q&A• To miniAMS-users: Which pressure do you have in the aerodynamic lens?
• For mAMS and TOF-ACSM, PM1 lens pressure should be ~1.75 mbar
• What is a suitable AB for ToF-ACSM ambient measurements and the typical response factor for that?• 1-4e5 ions/s, with an IE 100-500 ions/pg
• I would like to know the influence of m/z 44 artefacts in individual instruments, how it impact the results and the PMF analysis. • For our best on how to deal with m/z 44 artefacts see Freney et al., Aerosol Science and
Technology, 53:7, 830-842, DOI: 10.1080/02786826.2019.1608901
• ACSM Igor Updated Manual available?• No – we’re doing more Knowledge Articles to deal with specific questions, though
• Will acsm software be moved to Igor 7 or 8 (if not already)?• Tofware 3 is Igor 7/8 compatible• Acquility 2.3 is Igor 7 compatible• Q-ACSM works on Igor 6-8
January 20, 2021 Virtual AMS Users Meeting 2021 20
• Can the ACSM x resolve both CH2O+ and NO+ at m/z 30?
January 20, 2021 Virtual AMS Users Meeting 2021 21
Q&A