ICARUS Chamber Experiment: Nguyen Group_20190703_ALPHA-PINENE/OZONE/hydrogen peroxide_Ozone_Ammonium sulfate_control_for_20190702

Goals: Control experiment to quantify the SOA yield from a-pinene ozonolysis to subtract off from the corresponding experiment with NO2 (20190702) so that we can quantify just the a-pinene+NO3 contribution. Part of a series of varying initial seed particle surface area to see how that affects SOA formation.Summary: H2O2 and O3 were injected in the chamber and allowed to equilibrate. Ammonium sulfate seed particles were injected. Then a-pinene was injected and decayed by reaction with ozone. Gas phase was monitored by CF3O- CIMS and particle formation by SMPS. A filter was collected for later offline analysis.Organization: Nguyen Group Lab Affiliation: UC Davis Chamber: Tran's big bag of airExperiment Category: Gas phase chemical reaction, Aerosol formation Oxidant: Ozone Reactants: ALPHA-PINENE, OZONE, hydrogen peroxide Reaction Type: Dark oxidation Relative Humidity: 5 Temperature: 22 Seed Name: Ammonium sulfate Pressure: 755 Torr

实验目标：开展对照实验以量化α-蒎烯（ALPHA-PINENE）臭氧解反应生成的二次有机气溶胶（Secondary Organic Aerosol, SOA）产率，用于在后续包含二氧化氮（NO₂）的对应实验（20190702）中扣除该部分贡献，从而仅量化α-蒎烯与硝酸根自由基（NO₃）反应的贡献。本实验为一系列改变初始种子颗粒表面积的研究之一，旨在探究种子颗粒表面积对二次有机气溶胶生成过程的影响。
实验流程：将过氧化氢（H₂O₂）与臭氧（O₃）注入烟雾腔室并使其达到平衡状态，随后注入硫酸铵种子颗粒。之后注入α-蒎烯（ALPHA-PINENE），其将通过与臭氧的反应逐渐消耗。实验期间，采用CF3O-化学电离质谱（CF3O- CIMS）监测气相组分，采用扫描迁移率粒径谱仪（Scanning Mobility Particle Sizer, SMPS）监测颗粒生成情况。同时采集滤膜样品用于后续离线分析。
实验相关信息：负责团队为阮氏课题组（Nguyen Group Lab），所属院校为加州大学戴维斯分校（UC Davis）；实验装置为特兰团队的大型空气袋式烟雾腔室（Tran's big bag of air）；实验类别为气相化学反应、气溶胶生成；氧化剂为臭氧（O₃）；反应物包括α-蒎烯（ALPHA-PINENE）、臭氧、过氧化氢；反应类型为暗氧化反应；相对湿度为5%；实验温度为22℃；种子颗粒名称为硫酸铵；实验压强为755托（Torr）。