On the Relation between OH+, OH and CH+ Molecules, Neutral/Molecular Hydrogen and Major 5780/5797 DIBs

Relations between column densities of OH+, OH+ and CH+ molecules and between atomic and molecular hydrogen and intensities of major 5780 Å and 5797 Å diffuse interstellar bands are examined based on spectra of 46 stars. Data on OH+, OH, CH+ and atomic/molecular hydrogen were taken from the literature. Data on 5780 Å and 5797 Å DIBs are based mostly on our own measurements. Column densities of the OH+ are very well correlated with abundances of OH molecule and not correlated with CH+ and hydrogen in any form. Column densities of OH+ are better correlated with narrow 5797 Å than 5780 Å major DIB. The value of abundance ratio in the case of OH and OH+ molecules in the ISM is equal to 5.73±0.45.