---
instrument_id: '418'
data_file_original_name: '130904_ams.csv'
skip_headers: '1'
charts: ''
headers:
    - 'exp_time(min)'
    - 'HRORG (ug/m3)'
    - 'Cl_fromDMA(ug/m3)'
    - 'HRNH4 (ug/m3)'
    - 'O/C ratio'
    - 'H/C ratio'
    - 'N/C ratio'
dataset_id: '3431'
experiment_link: 'https://icarus.ucdavis.edu/chambers/553/experiments/606'
experiment_set_link: 'https://icarus.ucdavis.edu/chambers/553/experimentSets/215'
chamber_link: 'https://icarus.ucdavis.edu/chambers/553'
dataset_created_at: '2021-08-30 15:16:46'
dataset_updated_at: '2021-08-30 15:16:46'
instrument_link: 'https://icarus.ucdavis.edu/chambers/553/instruments/418'
instrument:
    id: '418'
    short_name: 'HR-ToF-AMS'
    full_name: 'High-resolution time-of-flight aerosol mass spectrometer'
    manufacturer: 'Aerodyne'
    model: '215-037'
    year: ''
    data_recording_software: 'ToF-AMS DAQ v4.0.40'
    data_analysis_software: 'SQUIRREL v1.61 and PIKA v1.21 modules for Igor Pro'
    raw_data_time_resolution: '100 Hz'
    analysis_data_averaging: '0.1 Hz'
    detection_limit: 'Detection limits for each class of chemical constituents are calculated as three times the standard deviation of blank signals measured from HEPA filter samples taken before each experiment.'
    quantification_limit: ''
    sensitivity_to_temperature: ''
    sensitivity_to_relative_humidity: ''
    sampling_method: 'Direct Sampling'
    sample_preparation_method: 'Submicrometer aerosol (35 nm-1.5 um) is sampled into the instrument through an aerodynamic lens at a flow rate of ~1.3 mL/s, producing a collimated particle beam that is directed onto a resistively heated surface where particles undergo vaporization (~600'
    sample_residence_time_in_seconds: ''
    length_of_tubing_in_cm: ''
    flow_rate: '1.3 mL/s'
    tubing_material: 'Stainless Steel'
    chemical_identification_method: 'Ions formed via electron impact ionization are detected with a custom-designed Tofwerk HR-ToF-MS configured in V-mode and operating at a mass resolution  of ~2100.'
    data_analysis_method: 'Data are analyzed using the SQUIRREL v1.61 and PIKA v1.21 modules for Igor Pro, and are corrected for gas-phase interferences and composition-dependent collection efficiencies.'
    quantification_method: 'he instrumental ionization efficiency is calibrated using dry, 350 nm ammonium nitrate particles. Mass loadings of sulfate, ammonium, chloride, and organic aerosol constituents are reported as "nitrate equivalent mass loadings (ug/m3)," assuming ionization efficiencies for these species relative to nitrate.'
    calibration_method: 'The instrumental ionization efficiency is calibrated using dry, 350 nm ammonium nitrate particles, generated via atomization of a dilute (0.01 M) aqueous solution of ammonium nitrate and size-selected with a DMA'
    calibration_drift_estimate: 'Low (on the order of weeks)'
    calibration_schedule: 'As Needed'
    uncertainty_estimation_method: 'N.A.'
    known_interferences: 'Mass spectral "air peaks," e.g., N2 interfering with aerosol-derived CO at m/z 28, are the most common interferences.'
    link_to_supplemental_information: ''
    additional_notes: 'The working principles, modes of operation, and analysis protocols for the HR-ToF-AMS have been extensively documented in the literature, so only brief descriptions are provided here.'
    organization_id: '540'
    created_at: '2020-03-13T22:57:47.000000Z'
    updated_at: '2020-03-24T20:18:20.000000Z'
    column_descriptors: "O:C is the oxygen to carbon atom ratio\r\nH:C is the hydrogen to carbon atom ratio\r\nN:C is the nitrogen to carbon atom ratio\r\nOM:OC is the organic mass to organic carbon ratio"
    sampling_protocol: 'Online'
    skip_headers: '1'
    tubing_inner_diameter: ''
    what_is_measured: 'Submicrometer, nonrefractory aerosol chemical composition; chemical speciation of sulfate, nitrate, ammonium, chloride, and organic aerosol constituents.'
    measurement_uncertainty: '(a) O:C (+/- 30%), (b) H:C (+/- 10%)'
    measurement_units: 'Unitless'

---
exp_time(min),HRORG (ug/m3),Cl_fromDMA(ug/m3),HRNH4 (ug/m3),O/C ratio,H/C ratio,N/C ratio
0,0.61653,181.5653506,,,,
3,0.7899,181.5653506,,,,
6,0.40486,181.5653506,,,,
9,0.52493,181.5653506,,,,
12,0.52696,181.5653506,,,,
15,0.52884,181.5653506,,,,
18,0.34684,181.5653506,,,,
21,0.14193,181.5653506,,,,
24,0.11624,181.5653506,,,,
27,0.04088,181.5653506,,,,
30,-0.04176,181.5653506,,,,
33,0.04466,181.5653506,,,,
36,0.10062,181.5653506,,,,
39,0.22788,181.5653506,,,,
42,0.20085,181.5653506,,,,
45,0.05635,181.5653506,,,,
48,0.23862,181.5653506,,,,
51,0.15176,181.5653506,,,,
54,0.13447,181.5653506,,,,
57,0.132,181.5653506,,,,
60,0.01795,181.5653506,,,,
63,-0.01235,181.5653506,,,,
66,-0.25334,181.5653506,,,,
69,-0.14308,181.5653506,,,,
72,0.16864,181.5653506,,,,
75,-0.13163,181.5653506,,,,
78,0.02696,181.5653506,,,,
81,-0.01615,181.5653506,,,,
84,0.18193,181.5653506,,,,
87,0.00544,181.5653506,,,,
90,-0.06506,181.5653506,,,,
93,0.02795,181.5653506,,,,
96,-0.03498,181.5653506,,,,
99,-0.04129,181.5653506,,,,
102,0.02148,181.5653506,,,,
105,-0.00723,181.5653506,,,,
108,0.10898,181.5653506,,,,
111,0.19513,181.5653506,,,,
114,0.42176,181.5653506,,,,
117,1.00934,181.5653506,,,,
120,1.05941,181.5653506,,,,
123,1.04222,181.5653506,,,,
126,1.16891,181.5653506,,,,
129,1.24627,181.5653506,,,,
132,1.43665,181.5653506,,,,
135,1.39793,181.5653506,,,,
138,1.37579,181.5653506,,,,
141,1.53934,181.5653506,,,,
144,1.63039,181.5653506,,,,
147,1.82242,181.5653506,,,,
150,1.58349,181.5653506,,,,
153,1.87408,181.5653506,,,,
156,1.66107,181.5653506,,,,
159,1.59591,181.5653506,,,,
162,1.77455,181.5653506,,,,
165,1.7739,181.5653506,,,,
168,1.48774,181.5653506,,,,
171,1.8981,181.5653506,,,,
174,1.87076,181.5653506,,,,
177,1.93713,181.5653506,,,,
180,1.92369,181.5653506,,,,
183,2.15028,181.5653506,,,,
186,1.94163,181.5653506,,,,
189,2.14507,181.5653506,,,,
192,1.94905,181.5653506,,,,
