Thermodynamic properties of air at high temperatures

Stupochenko, E. V.; Samuilov, E. V.; Pleshanov, A. S.; Rozhdestvensky, I.B.; Stakhanov, I. P.

doi:10.1016/s0082-0784(06)80527-8

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“…Herzberg 1950). The approximated partition function Q (Stupochenko et al 1961;Drellishak 1964) of diatomic molecules in all electronic states is calculated with .10) where i is the electronic state number and v jmax the cut-off vibrational quantum number (Arnold et al 1969). As a first step, we take the transition of B 3 Π g − A 3 Σ + u (=Q(T ex ) B−A ) into our fitting model for the simplicity, not Q(T ex ) total that includes the transition of all electronic states.…”

Section: Appendix Amentioning

confidence: 99%

Is a 2004 Leonid meteor spectrum captured in a 182 cm telescope?

Kasuga

Iijima²,

Watanabe

2007

A&A

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Context. It has been thought that fast-moving meteor spectra consist of only two excitation temperature regimes: the 5000 K main component and another hot component at 10 000 K. This belief does not always satisfy observed spectra due to the lack of sufficient physical correlation among derived excitation temperatures, observed fluxes, upper energy levels (E u ), and Einstein A coefficients (A ul ) of each spectral emission line. Aims. This work tries to correlate them and discovery new excitation temperature regimes in meteor spectra in the visual to near IR wavelength region. Methods. We focus on the upper energy levels and Einstein A coefficients of observed spectral emission lines. A model fitting the first positive band of nitrogen (N 2 ) and total number of Si II under quasi-neutral conditions proved the key to identifying of new components. Results. We have identified two new excitation temperature regions in meteor spectra. One is a Mid component at 8000 K for N 2 and another a Jet component above 10 000 K for Si II. This breakthrough has allowed us to reproduce the meteor spectrum. Conclusions. The spectra of high-speed meteors may consist of more than two excitation temperature regions including the main, Mid, hot, and Jet components.

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Section: Appendix Amentioning

confidence: 99%