The calcium monohydroxide radical ( CaOH ) is an important astrophysical molecule relevant to cool stars and rocky exoplanets , amongst other astronomical environments .
Here , we present a consistent set of highly accurate rovibronic ( rotation-vibration-electronic ) energy levels for the five lowest electronic states ( \tilde { X } ^ { 2 } \Sigma ^ { + } , \tilde { A } ^ { 2 } \Pi , \tilde { B } ^ { 2 } \Sigma ^ { + } , \tilde { C } ^ { 2 } \Delta , \tilde { D } ^ { 2 } \Sigma ^ { + } ) of CaOH .
A comprehensive analysis of the published spectroscopic literature on this system has allowed 1955 energy levels to be determined from 3204 rovibronic experimental transitions , all with unique quantum number labelling and measurement uncertainties .
The dataset covers rotational excitation up to J = 62.5 for molecular states below 29 000 cm ^ { -1 } .
The analysis was performed using the MARVEL algorithm , which is a robust procedure based on the theory of spectroscopic networks .
The dataset provided will significantly aid future interstellar , circumstellar and atmospheric detections of CaOH , as well as assisting in the design of efficient laser cooling schemes in ultracold molecule research and precision tests of fundamental physics .