---
instrument_id: '418'
data_file_original_name: '130605_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: '3422'
experiment_link: 'https://icarus.ucdavis.edu/chambers/553/experiments/603'
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 15:06:58'
dataset_updated_at: '2021-08-30 15:06:58'
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
0,2.40872,87.5371,26.5049,0.151976,2.04137,0.129513
3,2.36827,86.6369,26.3451,0.149969,2.03462,0.129039
6,2.46763,86.9053,26.4806,0.13536,2.0901,0.121654
9,2.47618,86.7007,26.4389,0.16019,2.07132,0.124431
12,2.57988,84.666,26.0545,0.150387,2.02084,0.124678
15,2.41495,84.6086,26.0029,0.124472,2.04354,0.127919
18,2.5058,83.7611,25.8516,0.12179,2.08118,0.122781
21,2.54484,83.1939,25.7498,0.15228,2.0341,0.123583
24,2.53871,82.7871,25.6953,0.142523,2.04154,0.121368
27,2.61676,83.7224,25.891,0.148886,2.04894,0.118215
30,2.79871,83.4885,25.8252,0.146866,2.08702,0.112321
33,2.5804,83.1859,25.8701,0.142386,2.02941,0.121287
36,2.77356,82.0675,25.5371,0.158286,1.98311,0.111487
39,4.12449,81.349,25.4412,0.198086,1.83129,0.0761814
42,3.22912,81.6159,25.4418,0.170853,1.95571,0.0969594
45,2.87825,84.2978,25.5899,0.170523,1.99721,0.106199
48,2.73842,80.825,25.2257,0.16056,1.97828,0.108532
51,3.31309,81.0995,25.3311,0.168442,1.93883,0.0906495
54,5.71857,82.4001,25.5812,0.210877,1.80138,0.0533073
57,5.60805,81.7506,25.2916,0.21173,1.81274,0.0548438
60,5.64149,81.6162,25.4637,0.212286,1.76291,0.0553506
63,6.44472,81.3966,25.2588,0.231755,1.74117,0.0471056
66,6.95378,83.9356,25.3182,0.225511,1.73514,0.0436739
69,7.14499,81.7518,25.3063,0.222605,1.75072,0.0421382
72,7.50937,81.7767,25.3259,0.229439,1.73821,0.0403734
75,7.69656,81.6481,25.347,0.225648,1.74859,0.0388487
78,8.3704,81.6493,25.3184,0.24084,1.70534,0.036346
81,8.64907,82.539,25.5162,0.239367,1.67808,0.0354318
84,9.36301,82.1339,25.3473,0.23764,1.71559,0.0315587
87,8.86068,81.1919,25.2062,0.233154,1.71033,0.0345411
90,10.0849,82.6008,25.4837,0.241014,1.70128,0.0305725
93,10.5266,82.5873,25.4371,0.244228,1.70509,0.0278823
96,11.7082,80.5845,24.774,0.24451,1.68144,0.0249667
99,12.5006,80.0915,24.6173,0.251071,1.66502,0.0235979
102,14.0948,81.0553,24.8884,0.2517,1.65829,0.0201022
105,14.863,85.3313,25.2736,0.257533,1.6661,0.0188626
108,14.6153,81.0675,24.7688,0.252241,1.66242,0.0186569
111,15.4745,81.4116,24.9029,0.248968,1.66812,0.0181953
114,15.9347,81.8155,25.0517,0.251955,1.65322,0.0171177
117,16.316,81.3704,24.9654,0.245892,1.66229,0.017078
120,17.2991,84.0398,25.3465,0.253558,1.66134,0.0172864
123,17.6502,82.5046,25.0607,0.253996,1.64607,0.0165798
126,18.4595,83.8353,24.9554,0.259967,1.63992,0.0150418
129,18.8205,82.1739,24.9991,0.251494,1.64832,0.0152686
132,19.3448,81.8333,24.9919,0.25495,1.64056,0.0148872
135,20.1448,81.8756,24.9738,0.255967,1.63999,0.0141526
138,20.8558,82.0621,24.8851,0.253274,1.64666,0.0131023
141,21.3951,81.6709,24.8398,0.25522,1.6443,0.0125222
144,22.4175,81.3839,24.7586,0.253334,1.64947,0.0119913
147,23.1916,81.1232,24.6554,0.254855,1.6381,0.0118926
150,23.6303,80.5454,24.5262,0.255518,1.63615,0.0116221
153,24.4108,80.8214,24.5821,0.256096,1.62802,0.0112899
156,25.2306,79.9991,24.3072,0.255691,1.63669,0.0105227
159,26.4928,79.7238,24.3095,0.254974,1.63343,0.0104423
162,26.7877,80.0314,24.2701,0.254424,1.63022,0.0103125
165,28.0403,82.4448,24.2789,0.256164,1.63227,0.00972586
168,28.5338,80.6873,24.3043,0.255347,1.63408,0.00957059
171,29.207,80.5929,24.1448,0.25117,1.63599,0.00884691
174,29.9412,80.4093,24.1822,0.254548,1.62876,0.00941802
177,30.7629,80.5827,24.224,0.257016,1.62402,0.00908627
180,31.285,81.9799,23.962,0.257851,1.6237,0.00875814
183,32.4769,80.9121,24.2578,0.256385,1.62297,0.0087217
186,33.466,80.9816,24.2252,0.254771,1.62495,0.00842088
189,34.5853,80.9194,24.0597,0.253751,1.6266,0.00806796
192,36.5023,81.7095,24.3601,0.256937,1.62692,0.00733729
195,36.4973,81.3639,24.1732,0.25631,1.62577,0.00772376
198,37.714,81.7419,24.1984,0.256072,1.62995,0.00721722
201,38.2033,83.4811,23.9879,0.259111,1.62198,0.00731388
204,38.9084,81.4851,24.0788,0.257667,1.62123,0.00705554
207,39.9619,81.813,24.1161,0.256462,1.63036,0.00672304
210,40.5868,82.0373,24.1522,0.254928,1.62525,0.00707802
213,41.6539,82.4475,24.2765,0.257254,1.62615,0.00672866
216,42.31,82.5125,24.3089,0.256123,1.62824,0.00629121
219,42.9584,82.6106,24.1907,0.257883,1.62356,0.00683606
222,43.3892,82.4074,24.1246,0.25779,1.61914,0.00640025
225,45.9007,87.1441,24.814,0.252982,1.63954,0.00628632
228,45.4191,82.864,24.3011,0.256208,1.62311,0.00619548
231,46.4874,83.327,24.3584,0.257611,1.62453,0.00583439
234,47.6775,83.7927,24.4589,0.25831,1.63112,0.00566757
237,48.4663,83.7473,24.458,0.259563,1.62698,0.00553
