Water is a fundamental molecule in the universe. On Earth, water exists in all three phases:
gas, liquid, and solid (ice). Liquid water facilitates many chemical reactions as a solvent …

Until a decade ago, the only anion observed to play a prominent role in astrophysics was H–
. The bound–free transitions in H–dominate the visible opacity in stars with photospheric …

We present the fifth release of the UMIST Database for Astrochemistry (UDfA). The new
reaction network contains 6173 gas-phase reactions, involving 467 species, 47 of which are …

We review the gas-phase chemistry in extraterrestrial space that is driven by reactions with
atomic and molecular ions. Ions are ubiquitous in space and are potentially responsible for …

We survey the current situation regarding chemical modelling of the synthesis of molecules
in the interstellar medium. The present state of knowledge concerning the rate coefficients …

We present the first astronomical detection of a diatomic negative ion, the cyanide anion CN-
, and quantum mechanical calculations of the excitation of this anion by means of collisions …

Context. Detailed astrochemical models are a key component to interpret the observations of
interstellar and circumstellar molecules since they allow important physical properties of the …

This review is concerned with the formation of molecules in the interstellar medium (ISM),
which is composed mainly of regions of gas and dust known as interstellar clouds, ranging …

Context. The inner layers of circumstellar envelopes around asymptotic giant branch stars
are sites where a variety of processes such as thermochemical equilibrium, shocks induced …

We perform a sensitive (line confusion limited), single-side band spectral survey towards
Orion KL with the IRAM 30 m telescope, covering the following frequency ranges: 80–115.5 …