Photodissociation spectra of single trapped CaOH+ molecular ions

• URL: http://arxiv.org/abs/2401.10854v2
• Date: Wed, 8 May 2024 07:32:03 GMT
• Title: Photodissociation spectra of single trapped CaOH+ molecular ions
• Authors: Zhenlin Wu, Stefan Walser, Verena Podlesnic, Mariano Isaza-Monsalve, Elyas Mattivi, Guanqun Mu, René Nardi, Piotr Gniewek, Michał Tomza, Brandon J. Furey, Philipp Schindler,
• Abstract summary: We report the photodissociation cross section spectra of $textCaOH+$ for single-photon processes at $lambda=$245 - 275$,$nm and for two-photon processes at $lambda=$500 - 540$,$nm. Measurements are interpreted with quantum-chemical calculations, which predict the photodissociation threshold for $textCaOH+to textCa++textOH$ at 265$,$nm.
• Score: 0.77473533303248
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Molecular ions that are generated by chemical reactions with trapped atomic ions can serve as an accessible testbed for developing molecular quantum technologies. On the other hand, they are also a hindrance to scaling up quantum computers based on atomic ions as unavoidable reactions with background gas destroy the information carriers. Here, we investigate the single- and two-photon dissociation processes of single $\text{CaOH}^+$ molecular ions co-trapped in $\text{Ca}^+$ ion crystals using a femtosecond laser system. We report the photodissociation cross section spectra of $\text{CaOH}^+$ for single-photon processes at $\lambda=$245 - 275$\,$nm and for two-photon processes at $\lambda=$500 - 540$\,$nm. Measurements are interpreted with quantum-chemical calculations, which predict the photodissociation threshold for $\text{CaOH}^+\to \text{Ca}^++\text{OH}$ at 265$\,$nm. This result can serve as a basis for dissociation-based spectroscopy for studying the internal structure of $\text{CaOH}^+$. The result also gives a prescription for recycling $\text{Ca}^+$ ions in large-scale trapped $\text{Ca}^+$ quantum experiments from undesired $\text{CaOH}^+$ ions formed in the presence of background water vapor.

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