---
instrument_id: '418'
data_file_original_name: '130906_ams.csv'
skip_headers: '1'
charts: ''
headers:
    - 'exp_time(min)'
    - 'HRORG (ug/m3)'
    - 'HRSO4(ug/m3)'
    - 'HRNH4 (ug/m3)'
    - 'O/C ratio'
    - 'H/C ratio'
    - 'N/C ratio'
dataset_id: '3442'
experiment_link: 'https://icarus.ucdavis.edu/chambers/553/experiments/607'
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 15:31:08'
dataset_updated_at: '2021-08-30 15:31:08'
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),HRSO4(ug/m3),HRNH4 (ug/m3),O/C ratio,H/C ratio,N/C ratio
0,0.388,60.1725,,,,
3,0.5396,59.6675,,,,
6,0.3971,58.7738,,,,
9,0.3116,59.4536,,,,
12,0.2425,58.3958,,,,
15,0.1131,58.1448,,,,
18,0.4738,59.0229,,,,
21,0.3822,58.9851,,,,
24,0.0677,57.5161,,,,
27,-0.034,58.121,,,,
30,-0.0628,58.2687,,,,
33,0.1018,57.4986,,,,
36,-0.0143,57.6867,,,,
39,0.3179,56.5052,,,,
42,0.5452,58.1076,,,,
45,0.4048,58.178,,,,
48,0.0384,57.8908,,,,
51,0.0207,57.5747,,,,
54,0.0533,57.5806,,,,
57,0.0174,57.8618,,,,
60,0.4743,58.4034,,,,
63,0.6271,58.3388,,,,
66,0.2974,57.7086,,,,
69,0.1404,57.9171,,,,
72,0.4416,58.4041,,,,
75,0.684,59.1075,,,,
78,0.694,59.6117,,,,
81,0.7543,65.1962,,,,
84,0.1309,58.6154,,,,
87,0.2822,64.3584,,,,
90,0.0901,58.2323,,,,
93,0.0938,58.4909,,,,
96,0.294,58.4306,,,,
99,0.336,58.6734,,,,
102,0.3097,58.4553,,,,
105,0.1521,58.6086,,,,
108,0.0649,58.7006,,,,
111,0.4694,65.3635,,,,
114,0.0749,59.1091,,,,
117,-0.11333,58.3249,,,,
120,-0.13463,58.5986,,,,
123,0.0045,59.4007,,,,
126,0.2818,66.0116,,,,
129,-0.0251,58.7338,,,,
132,-0.06635,59.2877,,,,
135,-0.1183,59.9598,,,,
138,-0.04549,60.4248,,,,
141,-0.08615,59.8693,,,,
144,-0.00312,60.3222,,,,
147,0.06387,60.7018,,,,
150,0.1165,60.5302,,,,
153,-0.05161,60.0594,,,,
156,0.01643,61.1833,,,,
159,0.31187,61.7124,,,,
162,-0.09874,60.923,,,,
165,-0.04561,61.7785,,,,
168,-0.00823,61.5816,,,,
171,0.30965,67.977,,,,
174,-0.01932,62.0237,,,,
177,0.32999,63.3497,,,,
180,0.01783,61.524,,,,
183,-0.04629,62.0326,,,,
186,0.46396,68.7574,,,,
189,0.16797,63.3975,,,,
192,0.15202,63.5882,,,,
195,0.0261,63.0094,,,,
198,0.06816,62.4695,,,,
201,0.02981,63.2631,,,,
204,0.1563,63.7402,,,,
207,0.03714,63.4422,,,,
210,0.13651,64.2943,,,,
213,0.17035,63.9287,,,,
216,0.23285,64.2352,,,,
219,0.18897,64.8891,,,,
222,0.20455,64.117,,,,
225,0.13117,65.0885,,,,
228,0.14855,64.4986,,,,
231,0.11972,63.7402,,,,
234,0.11469,65.2643,,,,
237,0.24403,65.4223,,,,
240,0.45029,71.152,,,,
243,0.23947,65.2289,,,,
246,0.44174,66.0152,,,,
249,0.11552,64.9167,,,,
252,0.34679,64.4862,,,,
255,0.33006,65.127,,,,
258,0.19806,65.3518,,,,
261,0.09654,65.2788,,,,
264,0.06829,64.3251,,,,
267,0.25836,64.9243,,,,
270,0.18048,64.3822,,,,
273,0.09518,65.2413,,,,
276,-0.00592,65.215,,,,
279,0.16349,64.6574,,,,
282,0.28294,64.8937,,,,
285,0.08044,65.3369,,,,
288,0.10745,65.7247,,,,
291,0.1123,64.8013,,,,
294,0.03866,64.5737,,,,
297,0.09881,65.2144,,,,
300,0.01291,65.5073,,,,
303,0.15397,63.8535,,,,
306,0.13914,65.0062,,,,
309,0.43643,65.2505,,,,
312,0.70609,67.4813,,,,
315,0.27152,65.284,,,,
318,0.48224,64.7358,,,,
321,0.182,65.2441,,,,
324,0.01746,64.5744,,,,
327,0.18467,64.1391,,,,
330,0.57546,70.2257,,,,
333,0.23189,63.6294,,,,
336,0.13671,64.0393,,,,
339,0.38978,64.2146,,,,
342,0.18537,64.2082,,,,
345,0.38912,64.8621,,,,
348,0.56226,63.6208,,,,
351,0.38433,64.4388,,,,
354,0.21584,64.3817,,,,
357,0.72777,62.3482,,,,
360,0.16469,64.5652,,,,
363,0.59498,63.8966,,,,
366,0.40103,65.1233,,,,
369,0.1766,64.5482,,,,
372,0.26017,64.6512,,,,
375,0.20572,64.5629,,,,
378,0.25171,64.4955,,,,
381,0.22469,64.7233,,,,
