Instrument - Time-of-flight aerosol mass spectrometer (Seinfeld)

Short name:
TOF-AMS (Low Resolution)

Full name:
Time-of-flight aerosol mass spectrometer (Seinfeld)

What is being measured:
Particle inorganic/organic composition

Sampling Protocol:



Instrument year :
None specified

Data recording software:

Data analysis software:
Igor Pro

Raw data time resolution:
1 s

Analysis data averaging:
20 s

Detection limit:
0.1 ug/m3

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

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

Sampling method:
Direct sampling through 1/4" stainless steel tubing

Sample preparation method:

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

Length of tubing (cm):

Instrument flow rate:
0.1 LPM

Tubing inner diameter:

Tubing material:
Stainless Steel

Chemical identification method:
Chemicals are identified by Electron Ionization mass spectra. Organics is determined by summing up organic fragments. Inorganics (ammonium, sulfate, nitrate, etc.) are determined by their ions.

Data analysis method:
Igor protocol by the Jimenez group (

Quantification method:
As reported, e.g., Zhang et al., 2005:

Calibration method:
Calibration with proxy standards.

Calibration drift estimate:
No estimate

Calibration schedule:
As Needed

Uncertainty estimation method:
Estimated by Matthew Coggon, operator of the TOF-AMS during the FIXCIT campaign (now at NOAA)

Known interferences:

Link to supplemental information:

Additional notes:
Note that aerosol growth was only observed during some experiments. These experiments have been analyzed using AMS high-resolution software (Pika) and are labeled as BulkHRTraces. In these files, you may find bulk organic, nitrate, ammonium, sulfate, O:C, H:C, OM:OC, S:C, and N:C traces. For all other experiments (in which no aerosol was observed), only bulk unit-mass resolution traces (labeled BulkUMRTraces) are given. Time is in seconds since start of the year.

Measurement uncertainty:

Measurement units: