Critical evaluation of measured rotation-vibration line positions of 16O1H in the X2П state using Ritz method

The results of critical evaluation of measured rotation-vibration line positions of 16OH in the X2 Π state are presented. The analysis was carried out using the fundamental Rydberg-Ritz combination principle, for the available experimental data in the spectral range 101-10358 cm-1. As a result, the precise set of 990 experimental energy levels of OH molecule in the interval 0-35665 сm-1 was obtained. Comparisons with the HITRAN and with known calculated energy levels are discussed.