1. State Selective Preparation and Nondestructive Detection of Trapped ${\rm O}_2^+$
- Author
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Singh, Ambesh Pratik, Mitchell, Michael, Henshon, Will, Hartman, Addison, Lunstad, Annika, Kuzhan, Boran, and Hanneke, David
- Subjects
Physics - Chemical Physics ,Physics - Atomic Physics - Abstract
The ability to prepare molecular ions in selected quantum states enables studies in areas such as chemistry, metrology, spectroscopy, quantum information, and precision measurements. Here, we demonstrate (2+1) resonance-enhanced multiphoton ionization (REMPI) of oxygen, both in a molecular beam and in an ion trap. The two-photon transition in the REMPI spectrum is rotationally resolved, allowing ionization from a selected rovibrational state of ${\rm O}_2$. Fits to this spectrum determine spectroscopic parameters of the ${\rm O}_2$ $d\,^1\Pi_g$ state and resolve a discrepancy in the literature regarding its band origin. The trapped molecular ions are cooled by co-trapped atomic ions. Fluorescence mass spectrometry nondestructively demonstrates the presence of the photoionized ${\rm O}_2^+$. We discuss strategies for maximizing the fraction of ions produced in the ground rovibrational state. The combination of state-selective loading and nondestructive detection of trapped molecular ions has applications in optical clocks, tests of fundamental physics, and control of chemical reactions., Comment: 9 pages, 6 figures, 3 tables
- Published
- 2024