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Experimental and Theoretical Study of the Broadening and Shifting of N 2 H + Rotational Lines by Helium
Author(s) -
Buffa Giovanni,
Tarrini Ottavio,
Dore Luca,
Meuwly Markus
Publication year - 2010
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201000230
Subject(s) - hyperfine structure , atomic physics , helium , coupling (piping) , close coupling , physics , rotational transition , chemistry , materials science , angular momentum , quantum mechanics , metallurgy
Pressure broadening and pressure shift of N 2 H + rotational lines perturbed by collisions with He are studied for the first time using experiment and theory. Results are reported from measurements at 88 K for the rotational transitions ${j = 3 \leftarrow 2}$ , ${4 \leftarrow 3}$ , ${5 \leftarrow 4}$ and ${6 \leftarrow 5}$ with frequencies ranging from 0.28 to 0.56 THz. The agreement between experiment and theoretical data derived from close coupling calculations confirms the reliability of a theoretical framework used for state‐to‐state transition rates of interest in the interpretation of spectroscopic data from interstellar molecular clouds. The influence of hyperfine effects on shifts and widths of the rotational lines is discussed in detail. Although in principle possible, experiment and theoretical considerations lead to the conclusion that hyperfine effects only play a minor role.

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