Chemical Processes & Instrument Development: Instruments

Instruments in our laboratory are primarily used to study fundamental processes that occur in the atmosphere via the characterization of the chemical and physical properties of atmospheric trace species. Laboratory instruments are used in the development of experimental methods to measure the reactivity and photochemistry, as well as, the optical and physical properties of stable, transient, and radical species. The experimental apparatus and methods used in our laboratory are designed to selectively detect species with high sensitivity under various temperature and pressure conditions on time scales ranging from nanoseconds to hours. No individual instrument is, however, capable of meeting all the requirements necessary to study all processes. Therefore, the instruments described below are commonly used in combination to develop a more comprehensive picture for a specific species or process.

Atomic Resonance Fluorescence RF Reaction rate coefficient measurements, photolysis quantum yields (H, O, Cl, Br) RF
Cavity Ring-down Spectroscopy (co-linear photolysis) CRDS Temperature and pressure dependent reaction rate coefficient measurements, product yields, absorption spectra, photolysis quantum yields CRDS
Chemical Ionization Mass Spectrometer CIMS Temperature dependent reaction rate coefficients, reaction product yields, heterogeneous chemistry/uptake measurements CIMS
Diode Array Spectrometer DA UV absorption spectra, photolysis quantum yields DA DA
Dual Wavelength Cavity Ring-down Spectroscopy DW-CRDS Reaction rate coefficients, product yields, spectrum measurements, photolysis quantum yields DW-CRDS DW-CRDS
ElectroSpray Ionization Mass Spectrometer ESI-MS Aqueous-phase chemistry, reaction mechanisms and product yields ESI-MS schematic
Fourier Transform Spectrometer FTIR High-resolution infrared absorption/emission spectra, absorption cross sections, reaction rate coefficients (RR), reaction product yields, reaction mechanisms FTIR FTIR
Laser Induced Fluorescence LIF Temperature and pressure dependent reaction rate coefficient measurements, product yields, OH photolysis quantum yields LIF
New Particle Formation NPF New particle formation mechanisms, nucleation and condensation yields NPF
Relative Rate Reactor RR Temperature and pressure dependent reaction rate coefficients (OH, Cl, O3, and NO3), reaction mechanisms, reaction product yields RR
Solubility and Hydrolysis S&H Henry's law coefficient measurements, hydrolysis rate coefficients and product yields S&H