Autodetachment of diatomic carbon anions from long-lived high-rotation quartet states

Abstract

Highly excited C${}_2{}^{-}$ ions prominently feature electron detachment at a mean decay time near 3 milliseconds with hitherto unexplained origin. Considering various sources of unimolecular decay, we attribute the signal to the electronic C${}^4{\Sigma }_u^{+}$ state. Quartet C${}_2{}^{-}$ levels are found to be stabilized against autodetachment by high rotation. Time constants of their rotationally assisted autodetachment into levels opening energetically at lower rotation are calculated by a theory based on the non-local resonance model. For some final levels of significantly less rotation the results conclusively explain the puzzling observations.

This is a letter of a joint submission aimed to Phys. Rev. Lett. with a companion paper in Phys. Rev. A. The title of the companion paper is: "Unimolecular processes in diatomic carbon anions at high rotational excitation"; Updated version (09/2024): Minor revisions, results unchanged

References in corpus (6)

• Laser Cooling of Molecular Anions
• Discovery of superthermal hydroxyl (OH) in the HH211 outflow
• Dissociative electron attachment to the H2O molecule. I. Complex-valued potential-energy surfaces for the 2B1, 2A1, and 2B2 metastable states of the water anion
• Enhancing reactivity of SiO${}^{+}$ ions by controlled excitation to extreme rotational states
• Spontaneous Electron Emission Versus Dissociation in Internally Hot Silver Dimer Anions
• Unimolecular processes in diatomic carbon anions at high rotational excitation

Cited by in corpus (1)

• Unimolecular processes in diatomic carbon anions at high rotational excitation