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

Large polycyclic aromatic hydrocarbon (PAH) molecules carry the infrared (IR) emission
features that dominate the spectra of most galactic and extragalactic sources. This review …

… on a strong continuum which follows a 1/X law (Tielens and … assume that JR emission
originates in the neutral photodissociation regions (Tielens and Hollenbach 1985a, b) …

This work provides a comprehensive overview of our theoretical and observational understanding
of the interstellar medium of galaxies. With emphasis on the microscopic physical and …

Observations of the solid-CO lines corresponding to particular protostars are compared with
respect to peak position and width and contrasted with the solid CO bands derived …

… LJ ALLAMANDOLA' AND AGGM TIELENS … of about 20 (Allamandola, Tielens, and
Barker 1984). Jf all of … dominated by the 1-0 transition (Allamandola, Tielens, and …

We present 2.5–30 μ m spectra from the Short-Wavelength Spectrometer of the Infrared
Space Observatory for a total of 23 sources. The sources include embedded young stellar …

We have theoretically modeled the gas heating associated with the photoelectric ejection of
electrons from a size distribution of interstellar carbon grains which extends into the …

Much of the interstellar medium in disk galaxies is in the form of neutral atomic hydrogen, H I.
This gas can be in thermal equilibrium at relatively low temperatures, T≲ 300 K (the cold …

We have studied the effects of shattering in grain-grain collisions. Based upon extensive
numerical simulation of surface explosions and impacts, an analytical model has been …