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Updated: May 28, 2026

Total Internal Reflection Absorption Spectroscopy (TIRAS) for the Detection of Solvated Electrons at a Plasma-liquid Interface
Published on: January 24, 2018
The calculation of the optical depths of homogeneous plasmas: analytical, experimental, and numerical considerations
Héctor O Di Rocco1, Fausto Bredice, Vincenzo Palleschi
1Instituto de Física Arroyo Seco (IFAS), Universidad Nacional del Centro, Pinto 399 Tandil, and CONICET, Argentina. hdirocco@exa.unicen.edu.ar
Abstract:
Starting from the general expressions describing the line emission by a homogeneous plasma in local thermal equilibrium (LTE), in the approximation of Lorentzian shape of the line profile, a universal expression can be obtained relating the optical depth of the line to measurable quantities such as integrated line intensity, peak value, and full width at half-maximum (FWHM). This universal curve could be used for calculating the optical depth from experimental spectra without knowledge of the spectroscopic parameters of the emission line. Examples are given using experimental and computer-generated synthetic spectra.
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