CS2 absorption cross-sections measurement in 280–360nm region using least absolute deviation method

We present ultraviolet absorption cross-sections of carbon disulfide (CS₂) in the 280–360 nm region at a resolution of 1 cm⁻¹. A novel algorithm, based on least absolute deviation (LAD) linear regression, was employed to calculate the cross-sections, achieving approximately 10 % error in the high signal-to-noise (SNR) band region. The proposed algorithm is broadly applicable to spectral calculations requiring high resolution and accuracy. Compared to existing data, which are predominantly low-resolution or incomplete, our measurements significantly enhance data quality, particularly in the band region with wavelengths longer than 320 nm, where solar radiation reaches the Earth’s surface. Additionally, we introduce a novel CS₂ photoexcitation reaction rate constant, J, under average global solar irradiance conditions. Furthermore, the propagated errors in the J values derived from the newly reported spectra have been reduced by two orders of magnitude, significantly enhancing the reliability of our measurements.