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 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 …

The negative molecular ion C 8 H-has been detected in the Galactic molecular source TMC-
1. Four rotational transitions have been observed in the centimeter-wave band with the …

Six anions have been conclusively detected in the interstellar medium (ISM). They all arrived
within a five-year window ending five years ago. Why have no new anions been detected? It …

We report conclusive evidence of an efficient cooling mechanism via the electronic radiative
transitions of hot small molecular anions isolated in vacuum. We stored C 6-and C 6 H-in an …

Molecular anions with polar neutral cores can support highly diffuse dipole-bound states
below their detachment thresholds due to the long-range charge–dipole interaction. Such …

It has been shown that rotational lines observed in the Horsehead nebula photodissociation
region (PDR) are probably not caused by lC 3 H+, as was originally suggested. In the search …

Absolute photodetachment cross sections have been measured for the hydrocarbon chain
anions C n H−, n= 2, 4, and 6, which are relevant for an understanding of molecular clouds …

The rotational spectra of the butadiyne anion C 4 H-and the octatetrayne anion C 8 H-have
been detected in the laboratory. Precise spectroscopic constants for these closed-shell …

The possibility of attaching near-threshold electrons to N-terminated carbon chains, like
those observed in the outer envelopes of carbon-rich stars, is examined via accurate …