High Pressure Flow
Background
The
High Pressure Flow System
(HPFS) was designed to function under a wide range of temperatures and pressures under truly wall-less conditions.
We can carry out discharge flow experiments under the
full range
of pressures and temperatures encountered in the atmosphere (180K - 400K, 2 torr - 700 torr).
This wide dynamic range in temperatures and pressures also allows us to expose subtelties of the
potential energy surface
for the chemical systems we investigate;
stable intermediates and multiple transition states frequenly cause unusual behavior at low temperatures and high pressures.
(We also have extensive online documentation, designed primarily for in-house use.)
Major Scientific Questions
- What governs the HOx-NOx partitioning of the upper troposphere and lower stratosphere?
- What controls ozone production efficiency in the urban atmosphere?
- What governs barrier heights in radical-molecule reactions?
- Why are some reactions direct and some indirect?
Recent Accomplishments and Current Work
- Understanding the fluid dymanics of the HPFS
- Measuring hydrocarbon-OH rate constants
- Elucidating reaction mechanisms
- Constraining HOx-NOx partitioning
- Exploring radical production in ozone-olefin reactions
Experimental Methods
- High Pressure Discharge Flow
- Reaction Modulation Spectroscopy
Measurement Techniques
- Laser Induced Flourescence
- Resonance Fluorescence
- UV absorption Spectroscopy
- FTIR absorption Spectroscopy
- FTUV absorption Spectroscopy
- Mass Spectrometry
- IR Cavity Ringdown Spectroscopy
Where to go from here
[
Theoretical Work
| Group Papers
]
[
Kinetics Home
| Group Members
| Group Alumni
| HPFS Documentation
| Other Papers
| FTP
| Anderson Group Home
]
Send comments to nmd@huarp.harvard.edu
Last updated: 24 March by nmd