2022A&A...657A..55S


Query : 2022A&A...657A..55S

2022A&A...657A..55S - Astronomy and Astrophysics, volume 657A, 55-55 (2022/1-1)

Deexcitation rate coefficients of C3 by collision with H2 at low temperatures.

SANTANDER C., DENIS-ALPIZAR O. and CARDENAS C.

Abstract (from CDS):


Context. An accurate analysis of the physical-chemical conditions in the regions of the interstellar medium in which C3 is observed requires knowing the collisional rate coefficients of this molecule with He, H2, electrons, and H.
Aims. The main goals of this study are to present the first potential energy surface for the C3 +H2 complex, to study the dynamics of the system, and to report a set of rate coefficients at low temperature for the lower rotational states of C3 with para- and ortho-H2.
Methods. A large grid of ab initio energies was computed at the explicitly correlated coupled-cluster with single-, double-, and perturbative triple-excitation level of theory, together with the augmented correlation-consistent quadruple zeta basis set (CCSD(T)-F12a/aug-cc-pVQZ). This grid of energies was fit to an analytical function. The potential energy surface was employed in close-coupling calculations at low collisional energies.
Results. We present a high-level four-dimensional potential energy surface (PES) for studying the collision of C3 with H2. The global minimum of the surface is found in the linear HH-CCC configuration. Rotational deexcitation state-to-state cross sections of C3 by collision with para- and ortho-H2 are computed. Furthermore, a reduced two-dimensional surface is developed by averaging the surface over the orientation of H2. The cross sections for the collision with para-H2 using this approximation and those from the four-dimensional PES agree excellently. Finally, a set of rotational rate coefficients for the collision of C3 with para- and ortho-H2 at low temperatures are reported.

Abstract Copyright: © ESO 2022

Journal keyword(s): astrochemistry - molecular data - molecular processes - scattering - ISM: molecules

VizieR on-line data: <Available at CDS (J/A+A/657/A55): table5.dat table6.dat>

Simbad objects: 4

goto Full paper

goto View the references in ADS

Number of rows : 4
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 IRC +10216 C* 09 47 57.40632 +13 16 43.5648           C9,5e 2275 0
2 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2148 1
3 HD 169454 s*b 18 25 15.1937863728 -13 58 42.309359544 7.39 7.61 6.71 5.82 5.13 B1Ia 327 1
4 HD 210121 * 22 08 11.9027578440 -03 31 52.765490316   7.84 7.68     B7II 164 0

To bookmark this query, right click on this link: simbad:objects in 2022A&A...657A..55S and select 'bookmark this link' or equivalent in the popup menu


2023.01.31-02:01:20

© Université de Strasbourg/CNRS

    • Contact