تأثير الأرغون كشريك تصادمي مع الأوكسجين في شريط امتصاص الأوكسجين المحرض بالتصادم الواقع في منطقة الأطوال الموجية 1.27 µm

الملخص EN

The collision induced absorption spectra of oxygen in gaseous mixture with argon at laboratory were measured, in the wavelength region of 1.27µm, using Cary 5000 spectrophotometer, and White absorption gas cell with a fixed path length of 9.6 m.

The variation of collision induced absorptions with pressure in mixtures with mixing ratio of 20%,50% and 80% of oxygen in argon for pressures between 1 and 25 bar at temperature of 298K were studied.

The absorption consisted of two overlapping bands.

The first one is a narrow absorption with rotational structure, and disappeared entirely when the pressure was higher than 12bar, and arise over the second one, which is a wide nonsymmetrical continuum absorption, and did not show any rotational structure.

Using the Origin 8.5 program, we extracted the narrow absorption band, and attributed it to the absorption of O2, while the continuum referred to the collision induced absorption CIA between oxygen molecules O2-O2, and oxygen with argon O2-Ar.

The results showed that the absorbance varied linearly with oxygen pressure for the narrow band, while the variation was quadratic for the continuum in all mixtures.

The integrated absorbance of wide band at constant oxygen pressure of 4bar with increasing argon pressure up to 20bar were studied.

It has been found that the integrated absorbance increased linearly with an argon pressure, because of the increasing contribution of argon in collision induced absorption CIA O2-Ar.

The efficiency of argon as a collision partner, was calculated according to the suggested equation, which gave an average value of about 0.20, if compared with oxygen itself.

This value agreed well with some references, and disagreed slightly with others.