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Absorption spectroscopy is attractive for combustion diagnostics because it allows in-situ and calibration-free quantification of reactants/products and thermometry. However, spectra measured at atmospheric pressure in the near-infrared telecom range, where laser sources and optical components are readily available, suffer from strong water interference. Cavity-enhanced optical frequency comb spectroscopy...
We measure broadband H2O and OH spectra in a flame using near-infrared cavity-enhanced Fourier transform optical frequency comb spectroscopy, we retrieve temperature and OH concentration, and compare water spectra to an improved line list.
The HCN/HNC linelist of Harris et al. ApJ, 578, 657, (2002), is the most accurate and extensive ab initio linelist in existence. However it suffers from the inherent accuracy problems of ab initio data. The band centres of some overtone bands deviate by up to 10 cm–1 from experimental values. To improve the quality of many of our line frequencies we are in the process of substituting the...
Remote plasma sources (RPS) are used in microelectronics fabrication to produce fluxes of radicals for etching and surface passivation in the absence of damage that may occur by charging and energetic ion bombardment. RPS reactors typically use flow distance and grids to reduce or eliminate charged particle fluxes from reaching the surface of the material being treated. Nitrogen trifluoride (NF3)...
A full understanding of the properties of substellar objects is one of the major challenges facing astrophysics. Since their discovery in 1995, we have discovered hundreds of brown dwarfs and extrasolar planets. While these discoveries have enabled important comparisons with theory, observational progress has been much more rapid than the theoretical understanding of cool atmospheres. The...
The first generation of stars (population III) comprised almost entirely of hydrogen and helium with trace quantities of Lithium. However no population III stars have yet been observed, but the detection of the most iron poor star known HE0107-5240 ([Fe/H]=–5.3) has sparked a new wave of interest in these stars. If population III stars formed with a mass of less than 0.8 M⊙, they will still...
Electron recollision in strong laser fields is usually studied with oriented molecules. This introduces orientation effects into the recollision problem which are generally not present in usual treatments of electron–molecule collisions. In addition this collision occurs with a molecular ion which means that the dominant electron– molecule interaction is the long-range Coulomb potential, which competes...
Here we present 2D simulations of an inductively driven SF6 silicon etch process in the GEC Reference Cell, performed with Quantemol-D and building upon previous calculations of SF6 plasma chemistries using Quantemol-P. Pressure and power trends along with chamber wide contour plots of gas-phase species concentrations and fundamental plasma properties are considered. We find good agreement with experimental...
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