Dual-broadband rotational CARS modelling of nitrogen at pressures up to 9 MPa. II. Rotational Raman line widths

Summary, in English

Rotational coherent anti-Stokes Raman spectroscopy (CARS) is a well-established spectroscopic technique for thermometry at pre-combustion temperatures an atmospheric pressure. However, at pressures of several MPa, a previous investigation revealed large discrepancies between experimental data and the theoretical model. A re-evaluation has been made of these data (at room temperature and in the range 1.5-9 MPa) with two improvements to the spectral code. The first is the inclusion of an inter-branch interference effect, which is described in detail in Paper I. The second is the use of experimental S-1-branch Raman line widths measured at 295 K, with a temperature dependence extracted from semi-classical calculations following the Robert-Bonamy formalism. It is shown that these two modifications significantly improve the theoretical model, since both the spectral fits and the accuracy of the evaluated temperatures are considerably improved.

• Author: Mikael Afzelius; Per-Erik Bengtsson; J Bood; J Bonamy; F Chaussard; H Berger; T Dreier
• Department/s: Combustion Physics
• Publishing year: 2002
• Language: English
• Pages: 771-778
• Publication/Series: Applied Physics B
• Volume: 75
• Issue: 6-7
• Links: http://dx.doi.org/10.1007/s00340-002-1020-7
• Document type: Journal article
• Publisher: Springer
• Topic: Atom and Molecular Physics and Optics
• Status: Published
• ISBN/ISSN/Other: ISSN: 0946-2171