Experiment: UCR-CECERT-APL-Cocker Group_20180831_ALPHA-PINENE_Ozone_No Seed_EPA2384A - Chen Le


Name: UCR-CECERT-APL-Cocker Group_20180831_ALPHA-PINENE_Ozone_No Seed_EPA2384A - Chen Le
Date: 2018-08-31


EPA chamber

Experiment Set
a-Pinene Ozonolysis with T&RH Swings 2018

How temperature and RH change as a whole affects the particle parameters.

How temperature and RH change as a whole affects the particle parameters.

Experiment Details


  • Photolysis, any phase
  • Aerosol formation
  • Aerosol aging
Temperature: 5 - 40
Relative Humidity: 99.99
Seeded Experiment: No
Fuchs Adjusted Surface Area:
Condensation sink rate coefficient: 99.99
Reaction type:
Oxidant Name: Ozone
Initial Oxidant Concentration Value: 500 (parts_per_billion)
RO2 Main Fate: Not Sure
RO2 Lifetime: (Seconds)
Pressure: 0.015'' H2O

Data Set plots
Choose a file: Choose the X-Axis:

Experiment Set Details

Name: a-Pinene Ozonolysis with T&RH Swings 2018
Time format and units: Time format in timeline is the absolute local time.
a-Pinene ozonolysis with temperature & humidity swings.


  • Chen Le APL
  • Weihan Peng APL
  • Huanhuan Jiang Env. Sci. Department
  • Ying-Hsuan Lin Env. Sci. Department, PI
  • Zixu Zhao Chemistry Department
  • Qi Xu Chemistry Department
  • Haofei Zhang Chemistry Department, PI
  • David Cocker APL, PI


Principal investigator:

David Cocker
E-mail: dcocker@engr.ucr.edu

Data Manager:

Chen Le
Phone: 9516603455
E-mail: cle030@ucr.edu


Reactant Compound type Concentration Concentration units
ALPHA-PINENE (319064711)
  • Alkene
250 Parts Per Billion

20180831_EPA2384_TimeLine.csv Timeline

Time (America/Los_Angeles) Action
0:00 Close valve 14; 60-degree turn fill air on humidifier overnight
9:03 NO span starts; flow 2|20|15|off
9:19 NO 70.4; NOx 73.0; GPT span starts; flow 2|20|15|0.7
9:24 Licor dew point 2C @ room temp 25C; humid air off
9:25 Fill air off; Air Handlers on; Box temp 18C; Chiller #1 on (60-62-64F)
9:28 Inject CO @1000 ccm to W bag for 45 min
9:29 NO 46.7; NOx 72.5; O3 span starts; flow 2|20|off|0.7
10:05 Inject 40uL PFB into W bag
10:08 Inject 132.5uL a-Pinene into W bag
10:09 O3 32.8; Starting E--W--Z sampling
10:28 Internally mix W bag for 1 min
10:39 Inject O3 @30 psi into W bag for 30 min
11:10 Elevators on (0.015'; 1s); PM formation T = 19.9C
13:53 Box 2C; Chiller #1 20-22-24F
15:00 Heaters on; Box 22C; Chiller #1 60-62-64F; Chiller #1 off
15:55 Chiller #1 on
16:12 Safety valve 120F; Box 38C; Chiller #1 90-92-94F; Chiller #1 off
17:37 Chiller #1 on
17:57 Heaters off; Box 18C; Chiller #1 45-47-49F
19:02 End of experiment (W:213 E:375)

Light Flux Characterizations:
Particle Loss Characterizations:
Vapor Loss Characterizations:

Chamber Details

Name: EPA chamber
Volume in cubic meters: 84.2
Shape: Rectangular Prism
Surface area in cubic meters: 126
Flow Mode: Batch
Flow through rate in liters per minute:
Body Material: Teflon
Body thickness: 2
Replacement date: 2017-11-07
Replacement frequency: As needed
Cleaning method: Flushing with air Flushing with air with UV lights on Oxidation Wipe with ultra-pure water if needed
o3 background: 10
nox background: 0
Particle background in micrograms per cubic meter: 0
Air filtration method: The chamber is using zero air from our air purification system
Mixing method: 0
Mixing method material:
Temparature Control: Yes
Temparature measurements recorded: Yes
Temparature range (min degrees celcius): 5
Temparature range (max degrees celcius): 45
Humidity Control: Yes
Humidity Measurements Recorded: Yes
Relative humidity range (min percent): 0.01
Relative humidity range (max percent): 80
Particle experiment capability: 1
Lights: Yes
Light source type(s): 350nm UVA Black Lamps
Supplemental information:
Additional Notes: