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Titel [sv]
Precision Fouriertransformspektroskopi med optiska frekvenskammar
Titel [en]
Precision Fourier Transform Spectroscopy with Optical Frequency Combs
Abstract [en]
We will perform broadband high-precision measurements of entire absorption bands of molecules such as CO, CH4, CO2, H2O, C2H2 and NO in the near- and mid-infrared wavelength range using optical frequency comb based Fourier transform spectroscopy (FTS), and determine molecular line shapes and their parameters over a wide range of pressures and temperatures with unprecedented accuracy and precision. The comb-based FTS is perfectly suited for this application, since it allows detection of broadband high-resolution spectra with high signal-to-noise ratios within acquisition times orders of magnitude shorter than conventional FTS based on thermal sources. Moreover, it is free from any influence of the instrumental line shape. In the near-infrared we will use an enhancement cavity to obtain high sensitivity to absorption, and we will characterize the influence of cavity dispersion on the molecular signal. We will analyze the molecular data using the Hartmann-Tran profile, which takes into account the speed dependence of the relaxation rates and the velocity changing collisions, as well as the correlations between them. The improved molecular line parameters and model spectra provided by our project in a wide range of conditions will allow better understanding of temperature and pressure dependences of molecular parameters, and better accuracy in analysis of experimental data in applications such as atmospheric research, astrophysics, and determination of fundamental constants.
ProjektledareFoltynowicz Matyba, Aleksandra
Koordinerande organisation
Umeå universitet
2017-01-01 - 2020-12-31
Nationell ämneskategori
Atom- och molekylfysik och optik
DiVA, id: project:1464Projekt id: 2016-03593_VR

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