Hyperfine effects on spectral line shape. II. The case DCO+-He
Authors: Buffa G., Tarrini O.
Autors Affiliation: CNR – Istituto Nazionale di Ottica and Dipartimento di Fisica dell’Università di Pisa
Abstract: We discuss the hyperfine effect on the shape of rotational spectral lines of DCO+ broadened by collisions with helium. Hyperfine scattering matrix is calculated by the recoupling technique from the spin-free scattering matrix which is obtained by close-coupling calculations and by a previously tested potential. Line shape is calculated for different rotational transitions, perturber density values, and collisional energies. As forecast by a semiclassical treatment and contrary to what may happen for a symmetric top absorber, hyperfine effects are small for a linear absorber. In our case they are of about 2%. We could also verify that the two hyperfine effects on the line shape, modification of resolved components and collisional coupling between them, cancel each other at high values of helium density when hyperfine structure collapses into a single line. (C) 2011 American Institute of Physics. [doi:10.1063/1.3585647]
Journal/Review: JOURNAL OF CHEMICAL PHYSICS
Volume: 134 (17) Pages from: 174310 to: 174310
KeyWords: collisional broadening; hyperfine structure; ions; collisional coupling; DOI: 10.1063/1.3585647Citations: 1data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2019-09-08References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here