CO-CIMS

This page documents the Colorado Front Range ToF-CIMS & Related Techniques Users Meetings, started in Feb. 2017.

Next Meetings

• We are planning on a 1/2 day meetings every year or so.
• The 2nd meeting will take place 24-Jan-2018, 1-5:30 pm, Ekeley S274 at CU-Boulder.
• The meeting format and frequency may evolve in the future, depending on the interests of the participants.

2nd Mtg: January 2018

• This meeting took place at CU on 24 Jan 2018.
• 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
• Advances in Instrumentation & software
  • Joost de Gouw: VOCUS PTR
  • to Tofware3.pdf Mike Cubison: Overview of the Tofware v3.0 data analysis software
• Sensitivity & Calibrations
  • Patrick Veres: IMR Pressure Regime Decisions, Consequences, and Things to Think About
  • Andy Neuman: IMR pressure gauge accuracy can affect sensitivity
  • Michael Link: IMR pressure dependent calibrations: potential importance of reagent ion chemistry
  • Michael Link: CIMS calibration intercomparison: How to compare instrument response between different instruments?
  • Harald Stark: Determining relative transmission factors for CIMS
• Background signals and related topics
  • Deming_Tubing delays_Teflon and other materials.pdf Demetrios Pagonis + Benjamin Demming: Gas-wall partitioning in sampling lines and instrument surfaces
  • delay model.pdf Demetrios Pagonis: Demonstration of tubing gas-wall partitioning Igor model software
  • Michael Link: Fast vs slow zeros and understanding limits of detection
  • Ryan Fulgham: Long-term sensitivity and background of acetate ToF-CIMS
• PMF
  • Derek Price: PMF of CIMS data
  • Harald Stark: PMF Errors for CIMS
  • Aroob Abdelhamid: PMF and error calculation for APi-ToF
• Applications
  • CIMS Meeting 20180124.pdf Matt Coggon: 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