Linewidths of ammonia in collisions with He: Calculations from an ab initio potential

Dhib, M.

doi:10.1016/j.jms.2009.11.008

Cited by 2 publications

(4 citation statements)

References 33 publications

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“…The molecular parameters introduced in the computations are given in Tables 1-3 of Ref. [24]. The results are illustrated in Tables 3 and 4, and graphically in Figs.…”

Section: Resultsmentioning

confidence: 99%

“…Calculations have been realized in the framework of the Robert and Bonamy semiclassical theory [18]. The implementation presented here comes as a direct extension of the works done for NH 3 [24,12,32].…”

Section: Semiclassical Robert-bonamy Calculationsmentioning

confidence: 99%

“…In a recent paper [24] we performed semiclassical calculations of halfwidths of NH 3 -He by using an ab initio PES, and considering only collision-induced transitions with DK = K 0 À K = 0. Presently, in order to improve the accuracy of our calculations, we have taken into account the DK = ±3n (n integer) transitions observed by Oka [25] for NH 3 perturbed by rare gases.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Semiclassical line broadening calculations using an ab initio potential. Application to NH 3 perturbed by argon

Ayari

Loreau

Dhib

et al. 2015

Journal of Molecular Spectroscopy

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The semiclassical formalism of Robert and Bonamy is used to calculate the linewidths of rovibrational transitions of ammonia in collision with argon. Two accurate ab initio potential energy surfaces (PES) have been applied to model the NH 3 -Ar interactions. In this work and contrary to our previous calculations, the transitions with DK = ±3n (n integer) have been introduced into the expressions of the differential collision cross section S(b). Comparisons with previous theoretical and experimental studies are reported. A detailed analysis of the contribution of the various anisotropic components of the PES shows that the induced DK = ±3 transitions play a crucial role. Calculations performed in the m 4 and m 1 vibrational bands of NH 3 are in good agreement with the experimental data and correct dependences of the broadening coefficients with the rotational quantum numbers J and K are obtained.

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“…The molecular parameters introduced in the computations are given in Tables 1-3 of Ref. [24]. The results are illustrated in Tables 3 and 4, and graphically in Figs.…”

Section: Resultsmentioning

confidence: 99%

Section: Semiclassical Robert-bonamy Calculationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Semiclassical line broadening calculations using an ab initio potential. Application to NH 3 perturbed by argon

Ayari

Loreau

Dhib

et al. 2015

Journal of Molecular Spectroscopy

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“…N 2 : lines broadened by H 2 (T) (Goméz et al 2011); by N 2 (E+T) (Thibault et al 2011b). NH 3 : lines broadened by H 2 and He (E) (Hanley et al 2009); by He (T) (Dhib 2010; by NH 3 (E) (Aroui et al 2009, Guinet et al 2011; by NH 3 and O 2 (E+T) (Nouri et al 2009). O 2 : lines broadened by O 2 (E) (Lisak et al 2010, Wójtewicz et al 2011; by O 2 and OO isotopologues (E) (Long et al 2011); by O and air (E) (Long et al 2010).…”

Section: Broadening and Shift Of Molecular Linesmentioning

confidence: 99%

Division Xii / Commission 14 / Working Group Collision Processes

Peach¹,

Dimitrijević²

2011

Proc. IAU

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Research in atomic and molecular collision processes and spectral line broadening has been very active since our last report, Peach, Dimitrijević & Stancil 2009. Given the large volume of the published literature and the limited space available, we have attempted to identify work most relevant to astrophysics. Since our report can not be comprehensive, additional publications can be found in the databases at the web addresses listed in the final section. Elastic and inelastic collisions among electrons, atoms, ions, and molecules are included and charge transfer can be very important in collisions between heavy particles.

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Linewidths of ammonia in collisions with He: Calculations from an ab initio potential

Cited by 2 publications

References 33 publications

Semiclassical line broadening calculations using an ab initio potential. Application to NH 3 perturbed by argon

Semiclassical line broadening calculations using an ab initio potential. Application to NH 3 perturbed by argon

Division Xii / Commission 14 / Working Group Collision Processes

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