P, Q, and R branches of the pure oxygen A-band at 762 nm

Authors

  • Muhammad Ahmad AL-Jalali

    A former Prof. Dr. at the Department of Physics, Faculty of Science, Taif University, Kingdom of Saudi Ara-bia

How to Cite

AL-Jalali, M. A. . (2025). P, Q, and R branches of the pure oxygen A-band at 762 nm. International Journal of Physical Research, 13(1), 12-22. https://doi.org/10.14419/h3rchs22

Received date: May 4, 2025

Accepted date: May 25, 2025

Published date: May 28, 2025

DOI:

https://doi.org/10.14419/h3rchs22

Keywords:

O2 Monomer; O2 Dimol; Absorbance; FWHM; Gaussian Width; Lorentzian Width; Branches; Rovibrational

Abstract

Oxygen A-band absorption spectra exhibit interference between O2 monomer (with a discrete line at 762 nm) and O2 dimol (which ‎also exhibits a band spectrum at 762 nm) absorption. Analysis of the absorbance spectrum between 750 nm and 770 nm reveals ‎P, Q, and R branches, characteristic of rovibrational transitions. Pure oxygen spectra were analyzed at pressures ranging from 1 to 25 bar and at temperatures of 298 K, 323 K, 348 K, and 373 K using advanced data analysis methods. Integrated absorbance, Gaussian and ‎Lorentzian full width at half maximum height (FWHM), and maximum absorbance peak positions were calculated for the R and ‎P branches, and relevant formulas were deduced.

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How to Cite

AL-Jalali, M. A. . (2025). P, Q, and R branches of the pure oxygen A-band at 762 nm. International Journal of Physical Research, 13(1), 12-22. https://doi.org/10.14419/h3rchs22

Received date: May 4, 2025

Accepted date: May 25, 2025

Published date: May 28, 2025