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 …

▪ Abstract Our understanding of the evolution of organic molecules, and their voyage from
molecular clouds to the early solar system and Earth, has changed dramatically …

Diffuse interstellar clouds have long been thought to be relatively devoid of molecules,
because of their low densities and high radiation fields. However, in the past ten years or so …

Carbon is a major player in the evolutionary scheme of the universe because of its
abundance and its ability to form complex species. It is also a key element in the evolution of …

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 …

Recent developments have made it possible to produce a variety of novel ionic molecular
species and to study their spectroscopy. In this article, new ion production schemes and/or …

We present an overview of the interstellar medium, including physical and chemical
conditions, spectroscopic observations, and current challenges in characterizing interstellar …

We establish correlations between equivalent widths of eight diffuse interstellar bands
(DIBs), and examine their correlations with atomic hydrogen, molecular hydrogen, and EB …

Recently, the presence of fullerenes in the interstellar medium (ISM) has been confirmed
and new findings suggest that these fullerenes may possibly form from polycyclic aromatic …

We discuss the proposal relating the origin of some of the diffuse interstellar bands (DIBs) to
neutral and ionized polycyclic aromatic hydrocarbons (PAHs) present in interstellar clouds …