Unimolecular processes in diatomic carbon anions at high rotational excitation
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F24%3A00600197" target="_blank" >RIV/61388955:_____/24:00600197 - isvavai.cz</a>
Výsledek na webu
<a href="https://hdl.handle.net/11104/0357551" target="_blank" >https://hdl.handle.net/11104/0357551</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevA.110.042828" target="_blank" >10.1103/PhysRevA.110.042828</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
Unimolecular processes in diatomic carbon anions at high rotational excitation
Popis výsledku v původním jazyce
On the millisecond to second time scale, stored beams of diatomic carbon anions C<sub>2</sub><sup>− </sup>from a sputter ion source feature unimolecular decay of yet unexplained origin by electron emission and fragmentation. To account for the magnitude and time dependence of the experimental rates, levels with high rotational and vibrational excitation are modeled for the lowest electronic states of C<sub>2</sub><sup>−</sup>, also including the lowest quartet potential. Energies, spontaneous radiative decay rates (including spin-forbidden quartet-level decay), and tunneling dissociation rates are determined for a large number of highly excited C<sub>2</sub><sup>−</sup> levels and their population in sputter-type ion sources is considered. For the quartet levels, the stability against autodetachment is addressed and recently calculated rates of rotationally assisted autodetachment are applied. Non-adiabatic vibrational autodetachment rates of high vibrational levels in the doublet C<sub>2</sub><sup>−</sup> ground potential are also calculated. The results are combined to model the experimental unimolecular decay signals. Comparison of the modeled to the experimental rates measured at the Croygenic Storage Ring (CSR) gives strong evidence that C<sub>2</sub><sup>− </sup>ions in quasi-stable levels of the quartet electronic states are the so far unidentified source of unimolecular decay.
Název v anglickém jazyce
Unimolecular processes in diatomic carbon anions at high rotational excitation
Popis výsledku anglicky
On the millisecond to second time scale, stored beams of diatomic carbon anions C<sub>2</sub><sup>− </sup>from a sputter ion source feature unimolecular decay of yet unexplained origin by electron emission and fragmentation. To account for the magnitude and time dependence of the experimental rates, levels with high rotational and vibrational excitation are modeled for the lowest electronic states of C<sub>2</sub><sup>−</sup>, also including the lowest quartet potential. Energies, spontaneous radiative decay rates (including spin-forbidden quartet-level decay), and tunneling dissociation rates are determined for a large number of highly excited C<sub>2</sub><sup>−</sup> levels and their population in sputter-type ion sources is considered. For the quartet levels, the stability against autodetachment is addressed and recently calculated rates of rotationally assisted autodetachment are applied. Non-adiabatic vibrational autodetachment rates of high vibrational levels in the doublet C<sub>2</sub><sup>−</sup> ground potential are also calculated. The results are combined to model the experimental unimolecular decay signals. Comparison of the modeled to the experimental rates measured at the Croygenic Storage Ring (CSR) gives strong evidence that C<sub>2</sub><sup>− </sup>ions in quasi-stable levels of the quartet electronic states are the so far unidentified source of unimolecular decay.
Klasifikace
Druh
J<sub>imp</sub> - Článek v periodiku v databázi Web of Science
CEP obor
—
OECD FORD obor
10403 - Physical chemistry
Návaznosti výsledku
Projekt
<a href="/cs/project/GA21-12598S" target="_blank" >GA21-12598S: Teorie pro disociativni rekombinaci chladných molekulárních iontů</a><br>
Návaznosti
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Ostatní
Rok uplatnění
2024
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název periodika
Physical Review A
ISSN
2469-9926
e-ISSN
2469-9934
Svazek periodika
110
Číslo periodika v rámci svazku
4
Stát vydavatele periodika
US - Spojené státy americké
Počet stran výsledku
27
Strana od-do
042828
Kód UT WoS článku
001350238400001
EID výsledku v databázi Scopus
2-s2.0-85208658302