Speaker
Guillermo G. Hinojosa Aguirre
(Universidad Nacional Autonoma de Mexico)
Description
We present the discovery and confirmation of a new negative molecular species, the CH$_4^−$ anion. The experimental realization of this high-spin exciplex was challenging because it overlaps at $m/q = -1$ with O$^-$, commonly present as a pollutant in vacuum systems. Electron detachment cross section (EDCS) showed diametrical differences with O$^-$ EDCS, this leaded to the hypotheses of negative methane which is not supposed to exist. Born–Oppenheimer molecular dynamics (BOMD) simulations finally revealed that this anion is a quartet ($S = 3/2$) metastable species, which leads to the formation of a molecular (CH$_2$ : H$_2$ )$^−$ excited complex.
| Email address | hinojosa@icf.unam.mx |
|---|---|
| Funding Agency | UNAM-PAPIIT-IN100426, SECIHTI-CF-2023-I-918. |
| Visitor's Visa | yes |
| Classification | Fundamental processes and modelling |
| Footnote | Plasma Sources Sci. Technol. 23 (2014) , Phys. Rev. Lett. 124, 056001 (2020). |
Author
Guillermo G. Hinojosa Aguirre
(Universidad Nacional Autonoma de Mexico)