ICARUS Chamber Experiment: 2014 FIXCIT Study_20140114_ISOPRENE/CYCLOHEXANE_Ozone_No Seed_Isoprene + O3, low NO, dry, no seeds

Goals:
Isolate ozone chemistry from OH chemistry (OHchem should read zero); investigate ozone-related interferences with OH instruments; explore product formation, and compare to 140106 ozonolysis experiment.
Summary:
This was as clean of an experiment as we could have hoped. Cyclohexane seemed to scavenge the OH well, as very low signals of OH+isop tracers were observed. GTHOS measured all milestones of the experiment, and observed much higher interference when isoprene was added. The reaction seemed well-mixed in the beginning, leading to less undesired chemistry. The expected ozonolysis products (like HMHP) were observed with CIMS, as well as 1-2 ug/m3 of particles that nucleated. The MAC and MVK traces on the GC-FID appear to be free of interferences. At the end lights were turned on at 100% for 1 h. After lights off, seeds were added for 1 h. Formaldehyde LIF measured successfully today, which is great news. There seemed to be some interference on the GTHOS even though OH was scrubbed, although interferences may be lower than at the end of the HPALD experiment.
Organization: 2014 FIXCIT Study
Lab Affiliation: California Institute of Technology
Chamber: Seinfeld chambers
Experiment Category: Gas phase chemical reaction
Oxidant: Ozone
Reactants: ISOPRENE, CYCLOHEXANE
Reaction Type: Photooxidation
Relative Humidity: 5
Temperature: 25
Pressure: 750 Torr

{'Goals': '旨在隔离臭氧化学与羟基化学（羟基化学应读取为零）；研究臭氧与羟基仪器的相关干扰；探究产物形成并与其与140106臭氧分解实验进行比较。', 'Summary': '本次实验达到了我们所能期望的纯净程度。环己烷似乎有效地捕捉了羟基，因为观测到的羟基+异丙基示踪剂的信号极低。GTHOS测量了实验的所有里程碑，并在添加异戊二烯时观察到更高的干扰。反应在初期似乎混合良好，导致不希望的化学变化减少。预期的臭氧分解产物（如HMHP）在CIMS上被观测到，同时还有1-2 μg/m³的成核粒子。GC-FID上的MAC和MVK色谱痕迹似乎未受干扰。实验结束时，灯光开启至100%持续1小时。关闭灯光后，添加种子进行1小时。今日成功进行了甲醛LIF测量，这是一个喜讯。尽管羟基已被清除，但GTHOS似乎仍存在一些干扰，尽管干扰可能低于HPALD实验的末端。', 'Organization': '2014年FIXCIT研究', 'Lab Affiliation': '加州理工学院', 'Chamber': 'Seinfeld室', 'Experiment Category': '气相化学反应', 'Oxidant': '臭氧', 'Reactants': '异戊二烯，环己烷', 'Reaction Type': '光氧化', 'Relative Humidity': '5', 'Temperature': '25', 'Pressure': '750 Torr'}