Speaker
Description
Electron impact recombination, (ro-)vibrational, electronic and dissociative excitation of molecular cations:
\begin{equation}
AB^+ + e^- \rightarrow AB^, AB^{} \rightarrow
\begin{cases}
A+B & \
AB^{+} + e^- & \
A+B^++e^-&
\end{cases},
\end{equation}
are in the heart of the molecular reactivity in the cold ionized media [1], being major charged particles destruction reactions and producing often atomic species in metastable states, inaccessible through optical excitations. They involve super-excited molecular states undergoing predissociation and autoionization, having thus strong resonant character.
The methods based on the Multichannel Quantum Defect Theory (MQDT) [1,2] are the most suitable for modeling these processes, since they account the strong mixing between ionization and dissociative channels, open - direct mechanism - and closed - indirect mechanism, via capture into prominent Rydberg resonances correlating to the ground and excited ionic states - and the rotational effects. These features will be illustrated for several cations of high astrophysical, planetary atmosphere and fusion edge plasma relevance, such as H$_2^+$ [3], BeH$^+$ [4], SH$^+$ [5], N$_2^+$ [6], NeH$^+$, NS$^+$ [7], N$_2$H$^+$ [8], C$_2$H$^+$, etc.
Comparisons with other existing theoretical and experimental results, as well as the isotopic effects, will be displayed.
Research supported by the Normandy region, LabEx PTOLEMEE, IEPE, CNRS-CEA CNES/PCMI and FR-FCM, ANR-MONA, NKFIH-OTKA and IAEA.
[1] I. F. Schneider, O. Dulieu, J. Robert, eds., EPJ Web of Conferences 84 (2015).
[2] J. Zs. Mezei et al, ACS Earth and Space Chem 3 2276 (2019).
[3] M. D. Epée Epée et al, MNRAS 512 424 (2022).
[4] S. Niyonzima et al, At. Data Nucl. Data Tables 115-116 287 (2017); S. Niyonzima et al, Plasma Sources Sci. Technol. 27 025015 (2018); N. Pop et al, ADNDT 139 101414 (2021).
[5] J. Boffelli et al, submitted to MNRAS (2023).
[6] A. Abdoulanziz et al, J. Appl. Phys. 129 052202 (2021).
[7] F. Iacob et al, Journal of Physics B: At. Molec. Optical Phys. 55, 235202 (2022).
[8] J. Zs. Mezei et al, submitted to EPJST (2023).
| Presenting Author | Zsolt J. Mezei |
|---|---|
| Presenting Author Email Address | mezei.zsolt@atomki.hu |
| Presenting Author Affiliation | Institute for Nuclear Research (ATOMKI), Debrecen, Hungary |
| Country | Hungary |
| Presenting Author Gender | Male |
