Short name:
CF3O TripleQ-CIMS

Full name:
Triple quadrupole chemical ionization mass spectrometer using CF3O- reagent (Wennberg)

What is being measured:
Methylhydroperoxide (CH3OOH), glycolaldehyde, IEPOX (isoprene epoxydiol), ISOPOOH (isoprene hydroxyhydroperoxide)

Sampling Protocol:
Online

Manufacturer:
Custom (Varian TQ)

Model:
Custom

Instrument year :
None specified

Data recording software:
Varian Workstation

Data analysis software:
Matlab

Raw data time resolution:
0.125 s

Analysis data averaging:
0.5 s averages of raw data. Time resolution of each ion (time spacing between scans) is roughly 40-50 sec.

Detection limit:
100 pptv

Sensitivity to temperature (and correction method, if applicable): :
Negligible for ions reported.

Sensitivity to relative humidity (and correction method, if applicable): :
Each ion is corrected for RH dependent ionization by an RH-dependent calibration factor.

Sampling method:
Direct sampling

Sample preparation method:
None

Sample residence time (chamber to instrument) (seconds):

Length of tubing (cm):
30

Instrument flow rate:
2 SLM

Tubing inner diameter:

Tubing material:
PFA Teflon

Chemical identification method:
By ion fragmentation in the triple quadrupole

Data analysis method:
Analysis by a custom Matlab script

Quantification method:
Baseline correction (from subtracting background period before reaction), dilution correction, then application of RH-dependent calibration factor.

Calibration method:
Acetic acid (permeation tube), Glycolaldehyde (commercial standard + FTIR analysis), ISOPOOH (synthesized standard), IEPOX (synthesized standard)

Calibration drift estimate:

Calibration schedule:

Uncertainty estimation method:
Uncertainties are estimated from propagating uncertainties in the steps of the absolute calibrations

Known interferences:

Link to supplemental information:
St. Clair et al: https://aip.scitation.org/doi/full/10.1063/1.3480552

Additional notes:

Measurement uncertainty:

Measurement units: