Molecular ions have long been considered key intermediates in the evolution of molecular
complexity in the interstellar medium. However, owing to their reactivity and transient nature …

Weak transitions in the (2, 0) overtone band of the hydrogen deuteride molecule at λ= 1.38 μ
m were measured in saturated absorption using the technique of noise-immune cavity …

We report the detection of OH+ and H 2 O+ in the z= 0.89 absorber toward the lensed
quasar PKS 1830–211. The abundance ratio of OH+ and H 2 O+ is used to quantify the …

OH+ and HO 2+ cations play a significant role in the chemistry of the cold interstellar
medium and hence their hydrogen abstraction reactions with H2 have to be included in ion …

We present a kinetics model description of a newly developed action spectroscopic method
for rotational spectroscopy based on rotational state-dependent three-body attachment of He …

The ExoMol database aims to provide comprehensive molecular line lists for exoplanetary
and other hot atmospheres. The data are expanded by inclusion of empirically derived line …

The oxygen-bearing molecular ions OH+, H 2 O+, and H 3 O+ are key species that probe the
ionization rate of (partially) molecular gas that is ionized by X-rays and cosmic-rays …

The protonated oxygen molecule, O 2 H+, and its helium complex, He-O 2 H+, have been
investigated by vibrational action spectroscopy in a cryogenic 22-pole ion trap. For the He-O …

The OH+ ion is of critical importance to the chemistry in the interstellar medium and is a
prerequisite for the generation of more complex chemical species. Submillimeter and …

Molecular ions are key reaction intermediates in the interstellar medium. OH+ plays a central
role in the formation of more complex chemical species and for estimating the cosmic ray …