---
instrument_id: '418'
data_file_original_name: '130607_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: '3426'
experiment_link: 'https://icarus.ucdavis.edu/chambers/553/experiments/604'
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 15:10:19'
dataset_updated_at: '2021-08-30 15:10:19'
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
-9,0.01314,84.7775,27.4067,0.225553,1.77931,0.0623036
-6,0.05332,84.9408,27.452,0.228124,1.77632,0.0571363
-3,0.03877,84.1417,27.1655,0.227906,1.77149,0.0566193
0,0.0547,84.4484,27.2574,0.235546,1.7786,0.0569046
3,0.04517,83.4609,27.1445,0.234037,1.76977,0.0579964
6,0.06151,83.993,27.3262,0.231527,1.76574,0.0596854
9,0.05548,82.4052,26.9361,0.229121,1.76247,0.0602185
12,0.05399,82.4754,26.9159,0.244779,1.75553,0.056017
15,0.14977,82.0599,26.8165,0.25245,1.7596,0.0552054
18,0.21646,81.3103,26.7546,0.256056,1.73188,0.0538414
21,0.27107,80.752,26.5451,0.249588,1.73293,0.0477868
24,0.16714,81.4059,26.6758,0.257118,1.74684,0.0555573
27,0.30053,80.7314,26.622,0.261863,1.72985,0.0506278
30,0.34398,80.8249,26.697,0.256503,1.70211,0.0484433
33,0.38858,79.2432,26.2774,0.260472,1.70968,0.0468874
36,0.44812,82.4206,26.4361,0.275296,1.70204,0.0482692
39,0.36649,79.4003,26.3249,0.264691,1.72201,0.0491747
42,0.57058,79.7333,26.4071,0.255465,1.7101,0.0456284
45,0.85011,79.4454,26.2927,0.259891,1.68421,0.0427237
48,1.87566,81.6741,26.678,0.26361,1.65264,0.0310718
51,0.48413,79.0713,26.3022,0.251089,1.71365,0.0446841
54,1.99852,79.7086,26.1386,0.287374,1.63529,0.031053
57,2.25887,81.8357,26.1025,0.284522,1.63208,0.0284472
60,2.58437,83.0258,26.4991,0.287579,1.62787,0.0263817
63,2.6677,80.3505,26.3322,0.281935,1.63011,0.0280203
66,4.19521,80.1566,26.1207,0.288017,1.6126,0.0199544
69,4.799,82.4572,26.4279,0.276015,1.60744,0.0181192
72,5.02387,79.7368,25.9735,0.281052,1.61255,0.0171105
75,5.15087,85.3551,26.7661,0.291714,1.60539,0.019169
78,5.60377,80.0935,26.0686,0.276748,1.61005,0.0155222
81,6.08772,79.3083,25.7313,0.273913,1.60808,0.0149567
84,6.93124,79.6107,25.775,0.281649,1.60628,0.0139537
87,7.35832,79.443,25.8041,0.283597,1.60201,0.013375
90,7.58725,78.6078,25.5038,0.287676,1.59935,0.0129994
93,8.3529,79.5826,25.6635,0.281137,1.59964,0.0111432
96,9.0522,80.2513,25.9278,0.281081,1.59657,0.0109129
99,9.4125,79.7264,25.6692,0.281173,1.59868,0.0108238
102,9.5541,79.6411,25.758,0.281768,1.60169,0.0106639
105,10.4703,80.2416,25.9362,0.285782,1.5981,0.0106516
108,11.5312,81.5527,26.1696,0.283059,1.59314,0.0087443
111,11.9559,80.536,25.9362,0.278774,1.59584,0.00912752
114,12.1767,79.9462,25.6097,0.283137,1.59493,0.00846652
117,13.088,81.1094,25.8572,0.279012,1.60209,0.00822849
120,14.1088,83.3298,25.9906,0.281235,1.59995,0.00717822
123,14.4244,81.1787,25.8461,0.281995,1.59816,0.00810954
126,15.5512,82.1365,26.1267,0.281425,1.59877,0.00738288
129,15.8219,81.8316,26.0605,0.282164,1.60073,0.00705972
132,16.57,81.8142,25.9477,0.278272,1.60061,0.00637724
135,17.6559,84.6594,26.1579,0.287059,1.59385,0.00629203
138,18.0104,82.0434,26.0092,0.281535,1.59978,0.00635045
141,19.0464,82.9054,26.1202,0.276616,1.60562,0.00581489
144,19.8045,83.0573,26.1169,0.277411,1.60686,0.00543053
147,20.9989,87.3234,26.7294,0.280429,1.60173,0.00578789
150,21.7525,83.9567,26.3843,0.277666,1.60705,0.00540849
153,22.545,84.2323,26.4207,0.278605,1.60699,0.00491256
156,23.067,84.417,26.5278,0.275161,1.61096,0.00500616
159,23.6289,85.9371,26.2668,0.281895,1.60055,0.00492572
162,25.5584,84.7538,26.3367,0.276491,1.6105,0.00444603
165,26.2055,86.2021,26.7508,0.278933,1.60829,0.00430741
168,27.3715,89.1461,27.3214,0.278422,1.60905,0.00461257
171,27.5712,85.3111,26.541,0.278696,1.6109,0.00421138
174,28.9474,88.3838,26.5667,0.282649,1.60618,0.00403462
177,30.115,86.2461,26.7408,0.278977,1.61283,0.00407135
180,29.3194,85.2124,25.7461,0.277839,1.60969,0.00400679
183,31.0723,86.6671,26.6749,0.277488,1.61319,0.00368367
186,31.6699,86.3803,26.5081,0.279436,1.61199,0.00399444
189,31.9266,87.0556,26.0405,0.280186,1.60944,0.00375054
192,33.8357,86.8617,26.6903,0.276282,1.61374,0.00378735
195,35.2348,89.7388,27.1716,0.277119,1.61754,0.00373575
198,34.894,87.2961,26.7179,0.275811,1.61579,0.0033719
201,35.4664,87.6203,26.8006,0.278496,1.61378,0.00324339
204,36.4288,87.1624,26.6643,0.279076,1.61473,0.00335767
207,38.0072,88.4436,27.1582,0.277124,1.62084,0.00326159
210,38.9309,88.9239,27.1264,0.277993,1.62141,0.00313455
213,38.101,87.4554,26.6733,0.275344,1.62122,0.00391213
216,39.3811,88.5902,26.9186,0.275825,1.61813,0.00352336
219,41.4399,91.2153,27.18,0.279539,1.61944,0.00293185
222,41.8741,89.8128,27.2516,0.276966,1.62129,0.00305748
225,42.5051,90.0219,27.2091,0.277373,1.62083,0.00327478
228,43.398,90.3551,27.2708,0.277592,1.6208,0.00307473
231,43.6889,90.1855,27.2488,0.277841,1.61976,0.00295136
234,44.219,89.2525,26.9641,0.276397,1.62515,0.0027274
237,44.8762,89.5374,27.0336,0.27648,1.62026,0.00294801
240,45.6152,91.2285,26.8765,0.281432,1.61943,0.0030219
243,45.0905,89.1748,26.9209,0.276392,1.62346,0.00339499
246,48.4969,91.7584,27.4899,0.277637,1.62699,0.00250679
249,48.2291,90.503,27.2275,0.276011,1.62585,0.00266163
252,48.9729,90.8837,27.2576,0.278109,1.62504,0.00279616
255,49.2895,90.5322,27.1156,0.277912,1.6249,0.00253222
258,50.0645,91.0877,27.3079,0.276514,1.62714,0.00248271
261,50.5138,90.9927,27.4084,0.278223,1.62385,0.00266781
264,51.8275,93.0957,27.1587,0.280798,1.61955,0.00265669
267,51.2067,89.8475,26.917,0.275856,1.62704,0.00235774
270,52.0211,90.4825,27.1194,0.27674,1.62784,0.00227685
273,52.2301,90.3429,27.1575,0.275221,1.62697,0.00243226
276,53.4966,90.7803,27.1674,0.276997,1.63021,0.00230574
279,53.2105,90.4263,27.0119,0.276383,1.62725,0.00267754
282,54.3436,91.8315,27.3528,0.277055,1.62361,0.00271326
285,54.4951,90.9876,27.009,0.276227,1.62965,0.00240628
288,55.2193,91.3013,27.211,0.275062,1.62941,0.00222862
291,56.0712,91.1691,27.2032,0.275685,1.63092,0.00219186
294,57.5532,94.429,27.2895,0.278198,1.62278,0.00219919
297,56.9266,91.027,27.0843,0.276092,1.6316,0.00217968
300,57.9587,91.848,27.3555,0.277105,1.62921,0.00231085
303,58.6258,91.2298,27.1664,0.27573,1.63157,0.00210107
306,57.6102,90.9372,26.8549,0.276399,1.6313,0.00211525
309,58.6285,90.8076,26.9833,0.276428,1.63057,0.00220682
312,58.8971,90.6511,26.9087,0.275367,1.6323,0.00202568
315,60.883,94.4106,27.1337,0.279698,1.62249,0.00237267
318,58.8784,89.941,26.7145,0.276811,1.62905,0.00204741
321,59.7011,91.071,26.892,0.275895,1.62993,0.00220836
324,60.8125,92.9799,26.8739,0.278296,1.62749,0.00201345
327,60.6484,90.5662,26.7812,0.275071,1.63268,0.0019012
330,61.2533,90.9302,26.8593,0.27469,1.63053,0.00211161
333,61.8732,90.9332,26.8647,0.275745,1.6349,0.00223068
336,62.7098,91.5599,27.0729,0.276035,1.63194,0.00207663
339,64.4441,93.7819,27.0393,0.278791,1.62806,0.00188837
342,62.7999,91.5713,26.9632,0.276294,1.62897,0.0019999
345,63.2257,90.672,26.7012,0.276903,1.63126,0.00204739
348,62.9483,90.2311,26.5124,0.276021,1.63051,0.00211937
351,63.3936,90.5944,26.5861,0.274889,1.63187,0.00223515
