The R-matrix method is an embedding procedure which is based on the division of space
into an inner region where the physics is complicated and an outer region for which greatly …

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 …

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The second edition of an established graduate text, this book complements the material for a
typical advanced graduate course in quantum mechanics by showing how the underlying …

We review the gas-phase chemistry in extraterrestrial space that is driven by reactions with
atomic and molecular ions. Ions are ubiquitous in space and are potentially responsible for …

Using an absorption line from the metastable (J, K)=(3, 3) level of H together with other lines
of H and CO observed along several sight lines, we have discovered a vast amount of high …

Context. The high degree of deuteration observed in some prestellar cores depends on the
ortho-to-para H 2 ratio through the H $ _3^+ $ fractionation. Aims. We want to constrain the …

This paper presents the first dissociative recombination (DR) measurement of electrons with
rotationally and vibrationally cold H 3+ ions. A dc discharge pinhole supersonic jet source …

Protonated molecular hydrogen, H3+, is the simplest polyatomic molecule. It is the most
abundantly produced interstellar molecule, next only to H2, although its steady state …

Atoms confined in optical tweezer arrays constitute a platform for the implementation of
quantum computers and simulators. State-dependent operations are realized by exploiting …