LeHavreV1, France, Analysis, bibRecord, 000812

The rotational excitation of HCN and HNC by He: temperature dependence of the collisional rate coefficients

Identifieur interne : 000812 ( France/Analysis ); précédent : 000811; suivant : 000813

The rotational excitation of HCN and HNC by He: temperature dependence of the collisional rate coefficients

Auteurs : F. Dumouchel [France] ; A. Faure [France] ; F. Lique [France]

Source :

Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2010-08-21.

RBID : ISTEX:75EF07EAEEC7F3D66F3CEBA1B792E2E3772E5DC4

English descriptors

KwdEn :
- molecular data, molecular processes, scattering.

Abstract

Modelling of molecular emission from interstellar clouds requires the calculation of rates for excitation by collisions with the most abundant species. This paper deals with the calculation of rate coefficients for rotational excitation of the HCN and HNC molecules in their ground vibrational state in collision with He. Calculations of pure rotational (de‐)excitation cross‐sections of HCN and HNC by He were performed using the essentially exact close‐coupling method. Cross‐sections for transitions among the 26 first rotational levels of HCN and HNC were calculated for energies up to 3500 cm−1. These cross‐sections were used to determine collisional rate constants for temperatures ranging from 5 to 500 K. The propensity rules of both collisional systems are discussed. A propensity for even Δj transitions is observed in the case of HCN–He collisions whereas a propensity for odd Δj transitions is observed in the case of HNC–He collisions. These propensities become less pronounced at high temperature, although they do not vanish within the temperature range considered in this work. The new rate coefficients will significantly help in interpreting HCN and HNC emission lines observed with current and future telescopes. In particular, the HNC/HCN abundance ratio derived from observations would have to be revised from values >1 to values ≤1.

Url:

DOI: 10.1111/j.1365-2966.2010.16826.x

Affiliations:

Links to Exploration step

ISTEX:75EF07EAEEC7F3D66F3CEBA1B792E2E3772E5DC4

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<front><div type="abstract" xml:lang="en">Modelling of molecular emission from interstellar clouds requires the calculation of rates for excitation by collisions with the most abundant species. This paper deals with the calculation of rate coefficients for rotational excitation of the HCN and HNC molecules in their ground vibrational state in collision with He. Calculations of pure rotational (de‐)excitation cross‐sections of HCN and HNC by He were performed using the essentially exact close‐coupling method. Cross‐sections for transitions among the 26 first rotational levels of HCN and HNC were calculated for energies up to 3500 cm−1. These cross‐sections were used to determine collisional rate constants for temperatures ranging from 5 to 500 K. The propensity rules of both collisional systems are discussed. A propensity for even Δj transitions is observed in the case of HCN–He collisions whereas a propensity for odd Δj transitions is observed in the case of HNC–He collisions. These propensities become less pronounced at high temperature, although they do not vanish within the temperature range considered in this work. The new rate coefficients will significantly help in interpreting HCN and HNC emission lines observed with current and future telescopes. In particular, the HNC/HCN abundance ratio derived from observations would have to be revised from values >1 to values ≤1.</div>
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The rotational excitation of HCN and HNC by He: temperature dependence of the collisional rate coefficients

The rotational excitation of HCN and HNC by He: temperature dependence of the collisional rate coefficients

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Abstract

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