Research Grants/Fellowships/SBIR

Laboratory Studies of Tropospheric Ozone Formation: A Novel Technique for Probing Volatile Organic Hydrocarbon Oxidation

EPA Grant Number: U915563
Title: Laboratory Studies of Tropospheric Ozone Formation: A Novel Technique for Probing Volatile Organic Hydrocarbon Oxidation
Investigators: Garland, Eva R.
Institution: California Institute of Technology
EPA Project Officer: Jones, Brandon
Project Period: September 1, 1999 through September 1, 2002
Project Amount: $102,000
RFA: STAR Graduate Fellowships (1999) RFA Text |  Recipients Lists
Research Category: Academic Fellowships , Engineering and Environmental Chemistry , Fellowship - Chemistry and Materials Science

Description:

Objective:

The objective of this research project is to design and implement a novel method for directly probing the primary kinetics and reaction pathways of several alkoxy radicals.

Approach:

It will be possible to detect the primary reaction products of the alkoxy radical with a novel technique called cavity ringdown spectroscopy (CRDS). CRDS provides high sensitivity with a time scale of a few microseconds. Pulsed radiation is injected into a cavity containing the sample to be studied that is bordered by two highly reflective mirrors, and the transmitted radiation decays exponentially, with a lifetime determined by the mirror reflectivities and losses due to absorption over the effective path length. CRDS provides for greater sensitivity than traditional spectroscopic techniques.

Expected Results:

This highly sensitive spectroscopic technique should allow for unprecedented detection of primary reaction products, which will ultimately lead to a better understanding of tropospheric ozone formation. The reaction apparatus also can be modified to probe many other reactions that are important in the atmosphere.

Supplemental Keywords:

alkoxy, isomerization, ozone, troposphere, cavity ringdown spectroscopy, CRDS., RFA, Scientific Discipline, Air, Environmental Chemistry, tropospheric ozone, Atmospheric Sciences, Environmental Engineering, ambient ozone data, spectroscopic studies, volatile organic hydrocarbon oxidation, isomerization, alkoxy radicals