تأثير درجات الحرارة المرتفعة على الامتصاص المحرض بالتصادم للأوكسجين الغازي (O2-O2)‎ و مزائج من غازي الأوكسجين و الآزوت (N2-O2)‎ في منطقة الطول الموجي µm 06.1

Abstract EN

Collisions induced absorption spectra of pure oxygen and gaseous mixtures of oxygen and nitrogen were measured at laboratory and studied, in the region of 1.06 µm, using Cary 5000 spectrophotometer, and White absorption gas cell with a path length fixed at 9.6 m.

The mixing ratio of oxygen in nitrogen were 20%, 50% and 80%, at temperature 298, 323, 348, 373 K and pressures between 1 and 25 bar.

The absorption band was centered at 1.06 µm, and raised as a wide continuum absorption, and did not show any rotational structure.

The studied absorption can be attributed to the transition1Δg (ᶹ =1) + 3∑-g (ᶹ = 0) ← + 3∑-g (ᶹ = 0) + 3∑-g (ᶹ = 0) and it’s a collision induced absorption CIA between oxygen molecules (O2-O2).

To validate this, we studied the variation of integrated absorbance in terms of temperature and pressure.

It was found that, they vary linearly with temperature and quadratically with pressure.

The absorption spectra of oxygen in mixture in this wavelength range, were shown that the effect of nitrogen molecules, as a collision partner, is greatly less than the effect of oxygen molecules O2 themselves.

This absorption band disappeared within the noise at temperature higher than 348 K, and when the pressure is lower than 5 bar, while it is still clear at higher pressure