Context. The elemental depletion of interstellar sulfur from the gas phase has been a
recurring challenge for astrochemical models. Observations show that sulfur remains …

The chemistry that occurs in the interstellar medium in response to cosmic ray ionization is
summarized, and a review of the ionization rates that have been derived from …

The rate at which the simplest triatomic ion (H3+) dissociates following recombination with a
low-energy electron has been measured in numerous experiments,,,,,,,,,. This process is …

Surprisingly large column densities of H have been detected using infrared absorption
spectroscopy in seven diffuse cloud sight lines (Cygnus OB2 12, Cygnus OB2 5, HD …

Prestellar cores, the birthplace of Sun-like stars, form from the fragmentation of the
filamentary structure that composes molecular clouds, from which they must inherit at least …

McCall et al. have recently shown that a large column density for the molecular ion H of≈ 8
10 13 cm-2 exists in the classical diffuse cloud towards ζ Persei. They have used this …

Reliable communication on the Internet is guaranteed by a standard set of protocols, used
by all computers. Here we show that these protocols can be exploited to compute with the …

We obtained the near-infrared (NIR) high-resolution (R≡ λ/Δλ∼ 20,000) spectra of the
seven brightest early-type stars in the Cygnus OB2 association for investigating the …

We present column density measurements of the HD molecule in the interstellar gas toward
17 Galactic stars. The values for the seven most heavily reddened sightlines, with, are …

Transient microstructure in the diffuse interstellar medium (ISM) has been observed towards
Galactic and extragalactic sources for decades, usually in lines of atoms and ions, and, more …