𝔖 Bobbio Scriptorium
✦   LIBER   ✦

On the sensitivity of rotational CARS N2 thermometry to the Herman–Wallis factor

✍ Scribed by Alexis Bohlin; Per-Erik Bengtsson; Michele Marrocco

Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
183 KB
Volume
42
Category
Article
ISSN
0377-0486

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Purely rotational spectral signals of coherent anti‐Stokes Raman scattering (CARS) from nitrogen molecules are studied as a function of the vibration–rotation interaction that weakens the rigid rotor approximation under which the dominant terms of the Raman cross section are calculated. The effect of the vibration–rotation interaction is quantified by means of the Herman–Wallis (HW) factor, and different approaches to its determination are evaluated in terms of their relative contribution to the CARS intensity and thermometric measurements made in a fuel‐rich hydrocarbon flame. Known HW factors are contrasted with more complete expressions of recent derivation, and it is found that relative line strength adjustments amount to about a few percent. Such differences result in temperature corrections of less than 1%. This value should be considered for the definition of the ideal thermometric accuracy of the technique but it is of minor importance in comparison with other sources of uncertainty (e.g. Raman line widths) that emerge from the complexity typical of reactive gas mixtures. Copyright © 2011 John Wiley & Sons, Ltd.

📜 SIMILAR VOLUMES

Rotational CARS N2 thermometry: validati
Rotational CARS N2 thermometry: validation experiments for the influence of nitrogen spectral line broadening by hydrogen
✍ Alexis Bohlin; Fredrik Vestin; Jeanine Bonamy; Pierre Joubert; Per-Erik Bengtsso 📂 Article 📅 2010 🏛 John Wiley and Sons 🌐 English ⚖ 186 KB

## Abstract Rotational coherent anti‐Stokes Raman spectroscopy (CARS) in fuel‐rich hydrocarbon flames, with a large content of hydrogen in the product gases (∼20%), has in previous work shown that evaluated temperatures are raised several tens of Kelvin by taking newly derived N~2~H~2~ Raman line

On the electronic origins of barriers to
On the electronic origins of barriers to methyl rotation: CNDO/2 calculations on (CH3)2XHn (X = C, Si, N, P, O, S) molecules
✍ G. Robinet; C. Leibovici; J.-F. Labarre 📂 Article 📅 1972 🏛 Elsevier Science 🌐 English ⚖ 605 KB

## CNDO calculations are performed for the homogeneous series of (CI13)2XH,I compounds (X = C, Si, N, P. 0, S) in order to dererminc the molecular equilibrium configuration. In agreement with available experimental data, for aI1 investigated molecules, the theoretical energy minimum is found for