CO-CIMS

This page documents the Colorado Front Range ToF-CIMS & Related Techniques Users Meetings, started in Feb. 2017. All presentations on this page are password protected, and only shareable with people who attended the meetings (to encourage informal presentations and discussion of preliminary results). These presentations are NOT citable. If you are an attendee and need access, please email Anne Handschy

Next Meetings

• We are planning on a 1/2 day meeting every year or so.
• The 5th meeting will take place in 2022
• The meeting format and frequency may evolve in the future, depending on the interests of the participants.

4th Mtg: March 2021

• This meeting took place 10-Mar-2021 on Zoom
• The schedule is here.
• Presentations
  • Michael Link (Colorado State University): Low-pressure inlet effects on ion signals
  • Melissa Morris (University of Colorado): Sorptive tubings
  • Tyson Berg (Colorado State University): Re-investigating an old reagent ion: Cl2
  • Michael Link (Colorado State University): Ion chemistry effects on acetyl peroxy radical calibrations
  • Olivia Jenks (University of Colorado): Measurement of gas-phase products from monoterpene oxidation using a Vocus PTR-TOF and Iodide HR-TOF CIMS
  • Ellie Browne (University of Colorado): Resolution enhanced Kendrick mass defect analysis
  • Harald Stark (University of Colorado, Aerodyne): Tofware update: newest features
  • Demetrios Pagonis (University of Colorado): Best practices survey results and discussion

3rd Mtg: April 2020

• This meeting took place 7-Apr-2020 on Zoom.
• The schedule is here.
• Presentations
  • Andy Neuman (NOAA): A VUV ion source for Iodide CIMS
  • Demetrios Pagonis (University of Colorado): Airborne EESI-TOF
  • Michael Link (Colorado State University): Comparison of quantification methods for acetate-CIMS: hourly calibrations versus parameterized sensitivities
  • Andrew Jensen (University of Colorado): Characterizing the drift of Vocus sensitivities during a field campaign
  • Harald Stark (University of Colorado, Aerodyne): Voltage scanning in CIMS: Towards absolute ion sensitivities?
  • Jose Jimenez (University of Colorado): EESI-TOF at HOMEChem and indoor partitioning and multi-instrument PMF
  • Olivia Jenks (University of Colorado): Using gas–wall partitioning in Teflon tubing to identify parent and fragment ions
  • Demetrios Pagonis (University of Colorado): Deconvolution of partitioning delays from time series
  • Harald Stark (University of Colorado, Aerodyne): Improved ion identification from multispectral multipeak fitting of high-resolution mass spectra

2nd Mtg: January 2018

• This meeting took place at CU on 24 Jan 2018.
• The schedule is here
• To encourage frank discussions, the decision was made to share presentations among those present. If interested in a particular talk, you may contact the presenter individually.
• Introduction
  • Jose L. Jimenez (University of Colorado): Intro, format, and any related discussions about this meeting
  • Harald Stark: Update on annual Aerodyne ToF-CIMS and other users meetings
• Advances in Instrumentation & software
  • Joost de Gouw (University of Colorado): VOCUS PTR
  • Mike Cubison (Tofwerk): Overview of the Tofware v3.0 data analysis software
• Sensitivity & Calibrations
  • Patrick Veres (NOAA, CIRES): IMR Pressure Regime Decisions, Consequences, and Things to Think About
  • Andy Neuman (NOAA, CIRES): IMR pressure gauge accuracy can affect sensitivity
  • Michael Link (Colorado State University): IMR pressure dependent calibrations: potential importance of reagent ion chemistry
  • Michael Link (Colorado State University): CIMS calibration intercomparison: How to compare instrument response between different instruments?
  • Harald Stark (University of Colorado, Aerodyne): Determining relative transmission factors for CIMS
• Background signals and related topics
  • Demetrios Pagonis + Benjamin Demming (University of Colorado): Gas-wall partitioning in sampling lines and instrument surfaces
  • Demetrios Pagonis (University of Colorado): Demonstration of tubing gas-wall partitioning Igor model software
  • Michael Link (Colorado State University): Fast vs slow zeros and understanding limits of detection
  • Ryan Fulgham (Colorado State University): Long-term sensitivity and background of acetate ToF-CIMS
• PMF
  • Derek Price (University of Colorado): PMF of CIMS data
  • Harald Stark (University of Colorado, Aerodyne):PMF Errors for CIMS
  • Aroob Abdelhamid (University of Colorado): PMF and error calculation for APi-ToF
• Applications
  • Matt Coggon (NOAA, CIRES): Methods for determining molecular functionality at the FIREX Fire lab

1st Mtg: February 2017

• This meeting took place at CU on 15 Feb 2017.
• The schedule is here

• Introduction
  • Jose L. Jimenez: Intro, format, and any related discussions about this meeting
  • Harald Stark Update on annual Aerodyne ToF-CIMS and other users meetings
• High-Resolution Peak Fitting Issues
  • Andy Neuman: Reasons for embracing negative peaks. I'll show examples of bias introduced by not allowing negative peaks, and discuss how to best measure compounds with mixing ratios that often approach zero
  • Ryan Fulgham: Harald's tools for peak fitting by functional group (no presentation)
  • Harald Stark: Data analysis Q&A (no presentation)
• Background signals and related topics
  • Matt Coggon: Post-Tofware Data Processing - Background Correction Procedures
  • Demetrios Pagonis: Tubing delay analysis
  • Ellie Browne: discussion on reducing backgrounds (no presentation)
• Calibrations
  • Jordan Krechmer: CIMS calibration: transmission curve and voltage scanning
  • Bin Yuan: Liquid Calibration Unit (LCU)
  • Ion Chemistry, IMR and related topics
  • Andy Neuman: Possible matrix effects with iodide ion chemistry. I'll show how the response to calibrations can depend on the background air composition.
  • Michael Link: How competitive are the rates of thermally enhanced processes and wall to gas partitioning with particle to gas partitioning using the "Aerosol CIMS" measurement technique?
  • Patrick Veres: IMR redesign tests and results
• Applications
  • Carsten Warneke: Intercomparison of I-CIMS and H3O+CIMS during FIREX Firelab
  • Harald Stark: Ambient amine measurements using protonated ethanol CIMS
  • Kanako Sekimoto: PMF analysis of Firelab data
  • Aroob Abdelhamid + Jennifer Berry: Applications of the APi-ToF
  • Patrick Veres: HCl and ClNO2 observations in Boulder via TOF CIMS and Picarro CRD