514 research outputs found
Cotorsion Pairs in C(R-Mod)
In [8] Salce introduced the notion of a co-torsion pair (A, B) in the category of abelian groups. But his definitions and basic results carry over to more general abelian categories and have proved useful in a variety of settings. In this article we will consider complete cotorsion pairs (C, D)in the category C(R-Mod) of complexes of left R-modules over some ring R.If(C, D) is such a pair, and if C is closed un-der taking suspensions, we will show when we regard K(C) and K(D) as subcategories of the homotopy category K(R-Mod), then the embedding functors K(C) → K(R-Mod) and K(D) → K(R-Mod) have left and right adjoints, respectively. In finding examples of such pairs, we will describe a procedure for using Hoveys results in [5] to find a new model structure on C(R-Mod)
Dissociative recombination and rotational transitions of D in collisions with slow electrons
Rate coefficients for dissociative recombination and state-to-state
rotational transitions of the D ion induced by collisions with very
low-energy electrons have been reported following our previous studies on
HD and H [9,10]. The same molecular structure data sets,
excitations ( for
to ) and de-excitations ( ,
for to ) were used for collision energies ranging from
meV to eV. Isotopic effects for dissociative recombination and rotational
transitions of the vibrationally relaxed targets are presented.Comment: 7 pages, 7 figures, 4 table
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