Abstract
Resonance scattering techniques are often used to study the properties of atoms and molecules. The Birmingham Solar Oscillations Network (BiSON) makes use of Resonance Scattering Spectroscopy by applying the known properties of potassium vapour to achieve ultra-precise Doppler velocity observations of oscillations of the Sun. We present a model of the resonance scattering properties of potassium vapour which can be used to determine the ideal operating vapour temperature and detector parameters within a spectrophotometer. The model is validated against a typical BiSON vapour cell using a tunable diode laser, where the model is fitted to observed absorption profiles at a range of temperatures. Finally we demonstrate using the model to determine the effects of varying scattering detector aperture size, and vapour temperature, and again validate against observed scattering profiles. Such information is essential when designing the next generation of BiSON spectrophotometers (BiSON:NG), where the aim is to make use of off-the-shelf components to simplify and miniaturise the instrumentation as much as practical.
Highlights
Resonance scattering techniques are often used to study the properties of atoms and molecules, such as energy levels and the fine and hyperfine structure [1]
We present a model of the resonance scattering properties of potassium vapour which can be used to determine the ideal operating vapour temperature and detector parameters within a spectrophotometer
The model is validated against a typical Birmingham Solar Oscillations Network (BiSON) vapour cell using a tunable diode laser, where the model is fitted to observed absorption profiles at a range of temperatures
Summary
Resonance scattering techniques are often used to study the properties of atoms and molecules, such as energy levels and the fine and hyperfine structure [1]. The Birmingham Solar Oscillations Network (BiSON) makes use of resonance scattering with a potassium vapour reference cell, enabling ultra-precise Doppler velocity measurements of oscillations of the Sun [7]. In this article we present a model of the resonance scattering properties of potassium vapour which can be used to determine the ideal operating vapour temperature, and spectrophotometer detector parameters, which are essential when developing new instrumentation making use of off-the-shelf components [8]. Profiles observed with a standard BiSON vapour cell at a range of temperatures.
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