Despite the generally hostile nature of the environments involved, chemistry does occur in
space. Molecules are seen in environments that span a wide range of physical and chemical …

Molecular absorption and emission bands dominate the visible, infrared, and submillimeter
spectra of most objects with associated gas. These observations reveal a surprisingly rich …

Context. Mid-infrared observations of photodissociation regions (PDRs) are dominated by
strong emission features called aromatic infrared bands (AIBs). The most prominent AIBs are …

The James Webb Space Telescope (JWST, Gardner et al. 2006) is a 6.5 m space telescope
launched in 2021 December and is developed by the National Aeronautics and Space …

Using physical models, we study the sensitivity of polycyclic aromatic hydrocarbon (PAH)
emission spectra to the character of the illuminating starlight, to the PAH size distribution …

ABSTRACT A significantly updated version of the NASA Ames PAH IR Spectroscopic
Database, the first major revision since its release in 2010, is presented. The current version …

We present a new method to accurately describe the ionization fraction and the size
distribution of polycyclic aromatic hydrocarbons (PAHs) within astrophysical sources. To this …

The characteristics of the CH stretching and out-of-plane bending modes in polycyclic
aromatic hydrocarbon molecules are investigated using anharmonic density functional …

Interstellar molecules are thought to build up in the shielded environment of molecular
clouds or in the envelope of evolved stars. This follows many sequential reaction steps of …

Conspectus Polycyclic aromatic hydrocarbon molecules (PAHs) are ubiquitously present at
high abundances in the Universe. They are detected through their infrared (IR) fluorescence …