Gawlas, Klaudia; (2022) Energy transfer and spin changing in collisions of Rydberg atoms with ground-state molecules at ~ 1 K. Doctoral thesis (Ph.D), UCL (University College London).

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Abstract

The resonant energy transfer process between Rydberg He atoms, with n values near 40, and ground-state NH3 molecules has been investigated experimentally at collision energies, Ekin, or temperatures Ekin/kB ∼1 K. Weak electric fields have been used to observe multiple individual reso- nances that resulted from the energy transfer between the inversion inter- vals in NH3 and ns→np electronic transitions in He. Experimentally, this was achieved through the use of quantum-state-selective detection of the Rydberg atoms, and an intrabeam collision apparatus that allowed low collision energies and long interaction times. The calculated energy-level structure of Rydberg He atoms, which has been used throughout to aid the interpretation of results in this thesis, has been tested experimentally and confirmed to be accurate for the work described here. In addition, this thesis reports on the first observation of collision-induced spin-changing arising from interactions of Rydberg He atoms with paramagnetic ground- state molecules, in this case O2.

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