Sep 5 – 7, 2023
Institute of Cosmos Sciences (ICCUB-IEEC)
Europe/Madrid timezone

Reactive collisions of electrons with molecular cations of astrophysical interest: effects to H2+, HD+, H3+ (poster pitch)

Speaker

Nicolina Pop (Politehnica University if Timisoara)

Description

The dissociative recombination (DR) together with the competing reactions – ro-vibrational excitation/de-excitation of the hydrogen molecular ion plays a decisive role in astrophysical ionized media: stars and interstellar molecular clouds, early Universe.
Using a stepwise method based on Multichannel Quantum Defect Theory (MQDT) [1], cross sections and rate coefficients have been obtained for reactions induced on HD+[2], H2+ [3] and D2+ [6] .
For H2+, the full rotational computations improved considerably, the accuracy of the resulting dissociative recombination cross sections and Maxwell isotropic rate coefficients [5]. The different mechanisms taken into account for H2+, i.e. direct vs indirect and rotational vs non-rotational processes are presented.
An analytic three-channel model was developed for the description of simultaneous direct and indirect DR cross sections of H3+ [4].
For these analyzed systems the results is in good agreement with the CRYRING (Stockholm) and TSR (Heidelberg) magnetic storage ring results.

References:
[1] Ch. Jungen, Handbook of High Resolution Spectroscopy, Wiley & Sons, New York, 471( 2011).
[2] O. Motapon, N. Pop, F. Argoubi, J. Zs Mezei, M. D. Epee Epee, A. Faure, M. Telmini, J. Tennyson, and I. F. Schneider, Phys. Rev. A, 90, 012706(2014)
[3] M. D. Epée Epée, J. Zs Mezei,2O. Motapon, N. Pop, I. F. Schneider, MNRAS, 455, 276–281 (2015).
[4] Ch. Jungen, N. Pop, I. F. Schneider, Phys. Rev. A, 86, 062706 (2012).
[5] E. Djuissi , N. Pop et al., Rom. Astron. J. 30, 101(2020).
[6] M. D. Epee´ Epee, ´ O. Motapon, N. Pop et al., MNRAS 512, 424–429 (2022).

Primary authors

Felix Iacob (West University of Timișoara, Romania) Ioan Schneider (Laboratoire Ondes et Milieux Complexes, CNRS, Univ. du Havre, France) Kalyan Chakrabarti (Scottish Church College, Calcutta, India) M. D. Epée Epée (University of Douala, Cameroon) Nicolina Pop (Politehnica University if Timisoara) Ousmanou Motapon (Univ. of Maroua, Cameroon) Mr Zsolt Janos Mezei (Atomki , Debrecen, Hungary)

Presentation materials