Deuterium Fra tionation in Interstellar Clouds

Isotopic Anomalies in Primitive Solar System Matter: Spin-state dependent fractionation of Nitrogen and Deuterium in interstellar clouds

2 00 1 Interstellar Gas in our Galaxy

3 The Copernicus Era 19 3.1 Cloudy Sightlines: ζ Oph . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 3.2 Intercloud Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 3.3 Deuterium . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 3.4 The Distribution of Nearby Clouds . . . . . . . . . . . . . . . . . . . . . . . 25 3.5 Molecular Hy...

un 2 00 2 The Interstellar Medium of our Galaxy

3 The Copernicus Era 17 3.1 Cloudy Sightlines: ζ Oph . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 3.2 Intercloud Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 3.3 Deuterium . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 3.4 Molecular Hydrogen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 3.5 The Distrib...

Fuse Determination of a Low Deuterium Abundance along an Extended Sight Line in the Galactic Disk

We present a study of the deuterium abundance along the extended sight line toward HD90087 with the Far Ultraviolet Spectroscopic Explorer (FUSE). HD 90087 is a O9.5III star located in the Galactic disk at a distance of ∼ 2.7 kpc away from the Sun. Both in terms of distance and column densities, HD 90087 has the longest and densest sight line observed in the Galactic disk for which a deuterium ...

Modelling of deuterium chemistry and its application to molecular clouds

We have developed new models of the chemistry of deuterium for investigating fractionation in interstellar molecular clouds. We have incorporated the latest information on reactions which affect deuteration, extended previous models to include S-D bonds for the first time and included the gasphase chemistry of some doubly-deuterated species.We present models for a wide range of physical paramet...