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Experimental and Theoretical Study of the Broadening and Shifting of N2H+ Rotational Lines by Helium

  Articoli su Riviste JCR/ISI  (anno 2010)

Autori:  Buffa G., Tarrini O., Dore L., Meuwly M

Affiliazione Autori:  CNR - IPCF Largo Pontecorvo 3 I-56127 Pisa (Italy); Dipartimento di Chimica "G. Ciamician" Universita' di Bologna, Via Selmi 2, I-40126 Bologna (Italy); Department of Chemistry Brown University, Providence RI 02912 (USA); Department of Chemistry, Klingelbergstr. 80, 4056 Basel, Switzerland

Riassunto:  Pressure broadening and pressure shift of N2H+ 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 <- 2, 4 <- 3, 5 <- 4 and 6 <- 5 with frequencies raging 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.

Rivista/Giornale:  CHEMPHYSCHEM
Volume n.:  11 (14)      Pagine da: 3141  a: 3145
Ulteriori informazioni:  LD acknowledges financial support from MIUR (PRIN 2007 funds, project \'Trasferimenti di energia, carica e molecole in sistemi complessi\") and from the University of Bologna (RFO funds). MM acknowledges financial support from the Schweizerischer Nationalfonds (grant 200021-117810).
DOI: 10.1002/cphc.201000230

*Impact Factor della Rivista: (2010) 3.340   *Citazioni: 10
data tratti da "WEB OF SCIENCE" (marchio registrato di Thomson Reuters) ed aggiornati a:  14/07/2019

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