- Pulsed Laser Photolysis – Laser Induced Fluorescence (PLP – LIF)
- Combustion & Atmospheric Chemistry
- Cavity ring down spectroscopy
- Gas Phase Chemical Kinetics
- Computational Chemistry
Atmospheric Chemical Kinetics and Spectroscopy
Any volatile organic compound (VOC) that is released in to the atmosphere will be lost in several processes, namely, via their reaction with OH radicals, photochemical decomposition, wet and dry deposition etc. The lifetime of any VOC is mainly governed by its reaction with OH radicals in the troposphere. Our research group will focus mainly on the determination of the rate coefficients of the reactions of VOC with OH radicals.
The method we employ to determine the rate coefficients of the elementary atmospheric reactions in our laboratory is Pulsed Laser Photolysis â€“ Laser Induced Fluorescence (PLP-LIF). We monitor the fluorescence of OH radicals using this method. Experimentally measured rate coefficients are used directly in the determination of the atmospheric lifetime of the particular VOC.
Cavity Ring Down Spectroscopy
To determine the absorption cross-sections and the quantum yield of formation of the transient species in the atmosphere, we adopt Cavity Ring Down Spectroscopic method. This is a wonderful tool, which is extremely sensitive because of very large path length (tens of kilometers).
The thermal rate constants are very much required to model combustion processes, incineration processes and also in the modeling of thermal decomposition of polyatomic molecules, which decompose through a complex reaction mechanism. A single pulse shock tube (SPST) will be used in the investigation to study the thermal decomposition of the molecules of interest. In this regard a new SPST facility is being established. Optical diagnostics like Laser Schlieren (LS) and Atomic Resonance Absorption Spectroscopy (ARAS) methods will be employed in near future.