---
instrument_id: '465'
data_file_original_name: '20170104_FIGAERO_MassSpec.csv'
skip_headers: '1'
charts: ''
headers:
    - 'm_q'
    - 'CPS (or normalized signal)'
dataset_id: '1797'
experiment_link: 'https://icarus.ucdavis.edu/chambers/535/experiments/499'
experiment_set_link: 'https://icarus.ucdavis.edu/chambers/535/experimentSets/206'
chamber_link: 'https://icarus.ucdavis.edu/chambers/535'
dataset_created_at: '2020-12-09 13:58:35'
dataset_updated_at: '2020-12-09 13:58:35'
instrument_link: 'https://icarus.ucdavis.edu/chambers/535/instruments/465'
instrument:
    id: '465'
    short_name: 'FIGAERO-HR-ToF-CIMS (near, particle, mass spec)'
    full_name: 'Filter Inlet for Gases and AEROsols coupled to High Resolution Time-of-Flight Iodide Chemical Ionization Mass Spectrometer'
    manufacturer: 'Aerodyne Research Inc.'
    model: 'N/A'
    year: ''
    data_recording_software: 'TofDAQ recorder'
    data_analysis_software: 'Tofware'
    raw_data_time_resolution: '1 Hz'
    analysis_data_averaging: '1s'
    detection_limit: 'N/A'
    quantification_limit: ''
    sensitivity_to_temperature: 'Not known'
    sensitivity_to_relative_humidity: 'Sensitivity varies depending on water vapor pressure in IMR. We add excess water vapors directly to IMR so H2O·I- does not varies substantially.'
    sampling_method: 'Direct sampling for gas-phase measurement. Filter collection followed by thermal desorption for particle-phase measurement.'
    sample_preparation_method: 'N/A'
    sample_residence_time_in_seconds: ''
    length_of_tubing_in_cm: '450'
    flow_rate: '0.4-6.8 lpm'
    tubing_material: 'FEP teflon / stainless steel'
    chemical_identification_method: 'Mass spectrometry technique with selective ionization toward polar species (e.g., organic acids, polyols, multi-functional, nitrates, some inorganic species etc) by iodide ions. Though the resolving power (4000-5500 depending on tuning) is limited, mass assignment is done carefully based on knowledge on iodide selectivity and precursor VOC chemistry.'
    data_analysis_method: "Raw data (1 Hz) are averaged to 10-s data using Tofware 2.5.1x in Igor 6.\r\nTake a close look at diagnostic data (e.g., pressures, temperatures, flow readings) and remove data points if abnormal.\r\nInstrument functions\r\nBaseline is determined using either smooth or median average routine built in Tofware using an integration width of 15 to account for a large negative mass defect of iodide ion.\r\nPeak width as a function of m/z is determined using a built-in algorithm in Tofware using a tolerance of 5 to 10.\r\nPeak shape is determined using a built-in algorithm in Tofware and manually removing ions with bad shapes.\r\nTime-series mass calibration built in Tofware, in general, is done at 1-min interval, using I-, H2O·I-, CHOOH·I-, HNO3·I-, CF3COOH·I-, I2-, and I3- as mass calibrants. Exact choice changes depending on types of experiments. Peak search range of 10, fit type of custom shape, and 2-param fit equation are generally used though they vary depending on application.\r\nHigh resolution peak fitting routine is performed following Stark et al. (2015, IJMS) and based on known precursor VOC chemistry as well as knowledge on iodide selectivity.\r\nBatch HR calculation is done by using fully constrained fitting, applying ToF duty cycle at m/z 127 (I-), subtracting baseline before fitting, and constraining isotopes and reallocating signals. Calculated signals are then normalized by ([I-]+[H2O·I-]/106) and dilution factor if used."
    quantification_method: 'All signals are normalized by ([I-]+[H2O·I-]/106) to account for changes in abundance of reagent ions over time. When dilution flow is desired and employed (not to deplete reagent ions and not to have secondary ion chemistry), signals are further corrected accordingly. Signals from particle-phase measurements are converted to gas-phase measurement equivalent signals based on the collection volume, gas-phase sampling flow rate,'
    calibration_method: "We do 2 types of calibrations: sensitivity and volatility calibration.\r\nFor sensitivity calibration, we either flow a known concentration of analyte (e.g., permeation tube) to gas-phase inlet and measure signal at multiple levels of concentration, or we deposit a known mass of analyte on filter (FIGAERO), desorb it and measure signal at multiple levels of mass.\r\nFor volatility calibration, we deposit a mixture of species with known subcooled vapor pressures (e.g., organic acids, polyols) and relate them to the desorption temperature (Tmax) obtained by a Gaussian fit."
    calibration_drift_estimate: 'No estimate'
    calibration_schedule: 'As Needed'
    uncertainty_estimation_method: 'We use an error provided by Tofware.'
    known_interferences: 'Changes in water vapor pressure in IMR changes sensitivity greatly, especially at a lower end of vapor pressure.'
    link_to_supplemental_information: ''
    additional_notes: ''
    organization_id: '546'
    created_at: '2020-12-07T02:21:04.000000Z'
    updated_at: '2020-12-07T02:21:04.000000Z'
    column_descriptors: '[]'
    sampling_protocol: 'Online'
    skip_headers: '1'
    tubing_inner_diameter: '1/4 inch'
    what_is_measured: 'Gas/Particle composition'
    measurement_uncertainty: 'NA'
    measurement_units: 'hz'

---
m_q,CPS (or normalized signal)
169.910835,NaN
169.923411,0.379238777
171.926485,0.068167984
172.910501,10.76924032
174.926151,NaN
186.926151,NaN
186.937384,1.846034487
190.921066,NaN
199.9214,0.177364126
200.905415,15.80880944
200.941801,0.813370784
201.93705,NaN
202.921066,15.6113397
214.921066,8.378166263
214.957451,0.896552391
216.90033,NaN
216.936716,26.70157518
218.91598,NaN
218.952366,3.899908446
220.93163,NaN
226.921066,1.334906698
226.957451,NaN
228.936716,2.424217538
229.931965,NaN
229.96835,0.159746367
230.91598,17.33665554
230.952366,1.629497297
242.91598,NaN
242.952366,1.397425684
244.93163,2.216418894
244.968016,0.195577806
245.926879,7.265377193
246.910895,0.112456293
246.94728,0.08854389
247.906144,301.8278891
256.93163,8.099134408
256.968016,2.517054904
258.910895,NaN
258.94728,2.098888979
258.983666,1.562048477
259.906144,33.55116539
260.926545,0.219611419
260.96293,NaN
260.999316,0.138222167
261.921794,4.937067644
261.958179,NaN
268.93163,1.972617813
268.968016,8.434143077
269.004401,0.400632755
270.94728,2.525480128
270.983666,7.967223308
271.020051,NaN
272.926545,4.296931278
272.96293,3.355442431
272.999316,0.519882475
273.921794,17.41909368
273.958179,0.573255914
274.942195,1.311205182
275.901058,8.06436582
275.937444,1.768648357
282.94728,15.21283383
282.983666,12.09482742
283.020051,0.711032026
284.926545,NaN
284.96293,14.32580145
284.999316,3.382161435
285.035701,0.057237277
286.905809,NaN
286.942195,2.722356881
286.97858,8.865380071
287.014966,0.147102661
287.901058,3.3934889
287.937444,17.67149573
287.973829,0.570880596
288.921459,NaN
288.957845,2.992290671
288.99423,0.855640122
289.916708,11.28713234
289.953094,0.739045934
289.989479,0.235464346
296.926545,0.533100731
296.96293,12.83101084
296.999316,16.76710265
297.035701,2.551377304
298.942195,4.502318857
298.97858,45.76000929
299.014966,5.268819572
299.051351,0.118159885
300.921459,NaN
300.957845,12.10018941
300.99423,7.636005504
301.030616,0.441723846
301.916708,6.39697439
301.953094,43.06984769
301.989479,1.226697491
302.900724,0.577789321
302.93711,0.703703678
302.973495,4.747811242
303.895973,NaN
303.932359,20.58695443
303.968744,2.602723549
304.00513,0.262988204
308.947674,NaN
308.96293,4.440699042
308.999316,7.635380872
309.035701,1.177825867
310.926939,NaN
310.963324,2.484931852
310.97858,12.29350298
311.014966,28.00463455
311.937444,6.446499417
311.973829,0.423689504
312.010215,0.112039311
312.957845,4.715696234
312.99423,37.81213127
313.030616,6.11325463
313.953094,52.4911608
313.989479,2.568146595
314.93711,1.542648743
314.973495,31.58542951
315.009881,4.412460893
315.932359,34.26219216
315.968744,34.12837802
316.95276,1.154220855
316.989145,4.91428465
317.911623,2.914237678
317.948009,28.69670659
317.984394,2.684757152
318.02078,0.393016856
318.895639,0.415841877
318.932024,1.698406521
318.96841,1.530348868
322.942195,0.770419088
322.97858,11.08248748
324.957845,NaN
324.99423,141.7769478
325.030616,6.872598949
325.989479,11.67739238
326.025865,2.811481069
326.973495,15.3643235
327.009881,63.52554812
327.046266,3.941869518
327.932359,14.59961552
327.968744,10.13876368
328.00513,3.592734379
328.95276,1.677347315
328.989145,15.21300032
329.025531,3.710657364
329.948009,103.5563277
329.984394,13.01478892
330.932024,1.045895001
330.96841,5.297589428
331.004795,2.344972782
331.927273,18.19296014
331.963659,32.45848988
332.000044,1.642877172
333.942923,15.95692856
333.979309,3.767364917
337.989479,16.92754685
338.93711,NaN
338.973495,24.56041011
339.009881,1.769119834
339.046266,1.816385557
339.968744,4.101750191
340.00513,27.18522763
340.95276,2.72629825
340.989145,40.77210867
341.948009,1.582554229
341.984394,224.7942892
342.02078,60.64958195
342.057165,6.900197941
342.96841,11.47638035
343.004795,30.18025503
343.041181,0.802227261
343.927273,14.54825494
343.963659,62.38350848
344.000044,72.09022791
344.03643,3.800352003
344.947674,0.619198028
344.98406,10.66988306
345.020445,2.643552646
345.942923,65.69010403
345.979309,20.20682665
346.015694,2.830870345
347.922188,1.115914284
347.958573,29.49244218
347.994959,2.806257692
353.984394,70.88498421
354.02078,4.123590228
356.000044,3961.535942
356.947674,1.751264335
356.98406,5.296016372
357.942923,22.57914179
357.979309,121.9493096
358.015694,1038.676641
358.963324,8.163942019
358.99971,7.963551077
359.958573,95.06630663
359.994959,100.7899787
360.031344,4.716183455
360.942589,1.329293761
360.978974,3.973326859
361.01536,1.044744923
361.067001,NaN
361.937838,71.75710673
361.974223,20.29646816
362.010609,3.86103652
363.953488,14.85513007
363.989873,3.372040045
367.963659,9.244410641
368.000044,2.007152878
369.979309,117.6565019
370.015694,27.11841879
370.926939,0.38345809
370.963324,4.445697912
370.99971,1.498902871
371.036095,0.463725678
371.994959,5414.009889
373.974223,222.0376203
374.010609,528.2536013
374.958239,9.87601212
374.994624,2.235925564
375.953488,14.19268215
375.989873,91.9500053
376.026259,6.174762346
383.145252,NaN
385.974223,260.886775
386.010609,41.29579676
387.953488,17.88686682
387.989873,524.7780498
388.026259,43.68133358
388.973889,2.040841101
389.969138,71.21309873
390.005523,439.6448893
391.948402,NaN
391.984788,106.8438507
392.021173,9.97525152
399.953488,9.22400284
399.989873,15.48521215
400.026259,3.65256804
400.985122,6.528508242
401.969138,144.1621626
402.005523,22.23591917
402.041909,0.90938133
402.964387,10.38038848
403.000772,58.43086836
403.984788,504.8075852
404.021173,52.69000562
405.964053,33.44620827
406.000438,134.1480841
407.979703,28.22510446
411.176552,4.048443834
416.943651,NaN
416.980037,57.52344382
417.964053,44.52848289
418.000438,11.18186442
418.036824,1.116551687
418.959302,6.903770402
418.995687,154.5680054
419.943317,0.848770783
419.979703,218.0239907
420.016088,25.10723429
420.052474,1.642023129
420.974952,26.36941707
421.011337,29.1619722
421.958967,3.042165655
421.995353,31.30300179
432.974952,125.2565608
433.958967,4.458958203
433.995353,8.458216211
434.954216,7.467271397
434.990602,68.12849341
435.026987,6.414770909
435.974617,22.04484452
436.969866,22.35920394
437.006252,15.29952037
438.949131,2.511480427
438.985516,9.448847916
446.954216,6.069456203
446.990602,2.950826895
448.969866,79.4787365
450.985516,38.27524469
464.964781,25.12598112
466.980431,13.85152208
479.97568,8.13645502
480.959695,7.816125541
484.047388,0.941358432
484.083774,11.36891915
496.047388,3.200937702
496.083774,6.022414014
496.120159,3.860637548
498.026653,2.346922846
498.063038,2.582229058
498.099424,11.26011057
510.063038,2.584537266
510.099424,17.36696344
510.135809,5.00575345
512.042303,3.61047436
512.078688,4.365214999
512.115074,18.76712017
514.057953,5.139816287
514.094338,10.47399871
522.063038,1.818646885
522.099424,12.04800873
522.135809,3.07181651
524.078688,3.716666813
524.115074,33.15131849
526.057953,3.039669917
526.094338,14.75493857
526.130724,16.91347505
528.073603,6.056358646
528.109988,10.74030658
529.068852,55.10721746
538.094338,22.09483449
540.109988,72.73320983
541.105237,40.72749827
541.141623,9.036006
542.089253,11.95661279
542.125639,4.101173401
545.063767,24.99725408
545.100152,4.058521976
553.105237,13.98633761
554.089253,12.3247693
555.120887,698.5454566
556.104903,17.37929962
557.100152,160.7996337
559.043031,6.66354195
559.079417,10.1826628
559.115802,15.52931427
561.058681,44.04850149
569.100152,482.0667146
570.084168,4.946066943
571.115802,3855.818246
573.095067,43.07187649
575.074331,10.6861866
575.110717,6.237696744
585.095067,220.2662202
587.110717,782.2628019
589.089981,73.28048594
601.089981,90.33300655
603.105631,336.0444014
616.10088,19.97805431
617.084896,36.32881565
619.100546,68.17497269
632.095795,68.5145218
633.079811,11.04896327
634.07506,14.04508114
634.111445,28.27432567