Observation of spin singlet butterfly Rydberg molecules in an ultracold atomic Rb gas
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866915574656794624 |
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| author | Exner, Markus Srikumar, Rohan Blättner, Richard Schmelcher, Peter Sadeghpour, H. R. Eiles, Matthew T. Ott, Herwig |
| author_facet | Exner, Markus Srikumar, Rohan Blättner, Richard Schmelcher, Peter Sadeghpour, H. R. Eiles, Matthew T. Ott, Herwig |
| contents | We report the observation of spin-singlet ultra-long range Rydberg butterfly molecules consisting of a ground-state atom bound to a Rydberg atom by $P$-wave scattering of $^{87}$Rb Rydberg electrons from $^{87}$Rb(5s) atoms. A three-photon excitation scheme enables the photoassociation of these molecules by weakly admixing Rb($18f_{7/2}$) states. The measured binding energies, kilo-Debye permanent electric dipole moments, and lifetimes are in excellent agreement with theory. Two long-lived vibrational levels, red detuned from the Rb($18f_{7/2}$) threshold, are observed. This experiment is a foundational step in the production of ultra-cold anions and heavy Rydberg ion-pair systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_21620 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Observation of spin singlet butterfly Rydberg molecules in an ultracold atomic Rb gas Exner, Markus Srikumar, Rohan Blättner, Richard Schmelcher, Peter Sadeghpour, H. R. Eiles, Matthew T. Ott, Herwig Atomic Physics We report the observation of spin-singlet ultra-long range Rydberg butterfly molecules consisting of a ground-state atom bound to a Rydberg atom by $P$-wave scattering of $^{87}$Rb Rydberg electrons from $^{87}$Rb(5s) atoms. A three-photon excitation scheme enables the photoassociation of these molecules by weakly admixing Rb($18f_{7/2}$) states. The measured binding energies, kilo-Debye permanent electric dipole moments, and lifetimes are in excellent agreement with theory. Two long-lived vibrational levels, red detuned from the Rb($18f_{7/2}$) threshold, are observed. This experiment is a foundational step in the production of ultra-cold anions and heavy Rydberg ion-pair systems. |
| title | Observation of spin singlet butterfly Rydberg molecules in an ultracold atomic Rb gas |
| topic | Atomic Physics |
| url | https://arxiv.org/abs/2510.21620 |