How reliable are line intensities for temperature calculation using the Boltzmann plot method

This study investigates the reliability of electron temperature calculations for plasmas using line intensities, specifically through the Boltzmann plot method. Simulated spectra of a copper plasma reveal that while using line intensities may be sufficient under certain conditions, significant deviations arise under high-pressure and low-temperature scenarios. Our findings emphasize the need for caution, as inaccuracies can occur when the optical depth reaches a relevant magnitude.