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 …

We present the revised" Meudon" model of photon-dominated region (PDR) code, available
on the Web under the GNU Public License. General organization of the code is described …

The internal energy available in vibrationally excited H 2 molecules can be used to
overcome or diminish the activation barrier of various chemical reactions of interest for …

We present a detailed analysis of an H2-rich, extremely strong intervening damped Ly α
absorption system (DLA) at z abs= 2.786 towards the quasar J 0843+ 0221, observed with …

We use observations of the C i, C ii, H i, and\mathrm {H}\, _ {2} column densities along lines
of sight in the Galactic plane to determine the formation rate of\mathrm {H}\, _ {2} on grains …

Aims. We probe the physical conditions in high-redshift damped Lyman-α systems (DLAs)
using the observed molecular fraction and the rotational excitation of molecular hydrogen …

We present the detection and detailed analysis of a diffuse molecular cloud at z abs= 2.4636
towards the quasar SDSS J 1513+ 0352 (z em≃ 2.68) observed with the X-shooter …

Using archival, high-resolution far-ultraviolet Hubble Space Telescope/Space Telescope
Imaging Spectrograph spectra of 34 Galactic O and B stars, we measure C i column …

We present a new, close relation between column densities of OH and CH molecules based
on 16 translucent sightlines (six of them new) and confirm the theoretical oscillator strengths …

We present a detailed study of the QSO–galaxy pair [SDSS J163956. 35+ 112758.7 (zq=
0.993) and SDSS J163956. 38+ 112802.1 (zg= 0.079)] based on observations carried out …