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MO: Fachverband Molekülphysik

MO 9: Molecules in Intense Laser Fields

MO 9.6: Vortrag

Montag, 11. März 2019, 17:30–17:45, S HS 002 Biologie

An alternative dissociation pathway of N₂²⁺ — Lazaros Varvarezos¹, •Alexander Achner², René Wagner², John Costello¹, Michael Meyer², and Patrik Grychtol² — ¹School of Physical Sciences and NCPST, Dublin City University, Dublin 9, Ireland — ²Small Quantum Systems Group, European XFEL GmbH, 22869 Schenefeld, Germany

Since the advent of lasers as spectroscopic tools, N₂ has served as a benchmark system to shed light on the phenomena induced by intense laser fields. In our study, we focus on the dissociation mechanism of the molecular dication N₂²⁺. Our interest in the dication was stimulated by a study that revealed the presence of two different N⁺ +N⁺ states, energetically separated by about 4 eV for the first time [1]. Our findings suggest the presence of two ion pairs, separated by approximately 2 eV originating from fast and slow decay channels. Most likely, the fast pair of ions stems from the ¹Σ_g⁺ state after the removal of two 3σ_g electrons, while the slow ion pair results from the ³Π_u state of the molecular ion after the removal of one 3σ_g electron and one 1π_u electron. Furthermore, we reach to the very important conclusion that the slow channel is the precursor for the N₂²⁺ ions, due to the existence of a strong intensity dependence, which is not present in the case of the faster ions.
[1] Lai et al., Physical Review A 84, 043413 (2011).