Short name:
CF3O- CIMS: positive mode, raw spectra

Full name:
chemical ionization mass spectrometer

What is being measured:
VOCs (esp. carbonyls)

Sampling Protocol:
Online

Manufacturer:
Varian

Model:
1200

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

Detection limit:
100 ppt

Sensitivity to temperature (and correction method, if applicable): :
uncertain

Sensitivity to relative humidity (and correction method, if applicable): :
Compound-dependent

Sampling method:
Direct sampling

Sample preparation method:

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

Length of tubing (cm):
100

Instrument flow rate:
2 lpm

Tubing inner diameter:
0.16 in

Tubing material:
FEP Teflon

Chemical identification method:
This CIMS is predominantly for use in negative mode, but can also be operated in positive mode, such that species can be observed typically as [M+H], unless an additional co-reagent is added. We do not calibrate in positive mode, so only normalized counts are reported.

Data analysis method:

Quantification method:
Baseline correction, dilution correction

Calibration method:
N/A

Calibration drift estimate:
Low (on the order of weeks)

Calibration schedule:
As Needed

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. (DOI 10.1063/1.3480552)

Additional notes:

Measurement uncertainty:
+/- 50% unless otherwise noted

Measurement units:
normalized counts