FYI. --------------------------------------------------------------------------------- Daniel Manzano Electromagnetism and Condensed Matter Department Institute “Carlos I” for Theoretical and Computational Physics University of Granada Facultad de Ciencias, Av. Fuentenueva s/n Granada 18071, Spain Phone: +34 958241000 Ext: 20569 https://ic1.ugr.es/members/dmanzano/

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From: Rosario Gonzalez-Ferez Subject: [InfoiC1] Seminario Multi-Photon Rydberg States in a Microwave Cavity and Rydberg Assisted Sympathetic Cooling Date: 10. April 2024 at 15:38:18 CEST To: infoic1@onsager.ugr.es

Estimados compañeros,

El Prof. Seth Rittenhouse de la United States Naval Academy en Annapolis (EEUU), impartirá el siguiente seminario

Título: Multi-Photon Rydberg States in a Microwave Cavity and Rydberg Assisted Sympathetic Cooling

Lugar: Seminario del Department de Física Atómica, Molecular y Nuclear

Fecha: Jueves 11 de Abril del 2024 a las 11:00

Abstract: In this seminar I will present results from two recent projects.

First, I will discuss recent experimental and accompanying theoretical results from an ultracold gas of Rb85 in a microwave cavity. The cavity is tuned to the 67S_{1/2} to 66P_{3/2} Rydberg transition. Due to the fact that the nS Rydberg states are energetically nearly half-way between the nP and (n-1)P states, states from two- and three-photon transitions appear in the resulting Rydberg spectrum. To measure the spectrum, a new method of spectroscopy is employed through monitoring atom loss due to anti-trapped Rydberg states. We also present a simple theoretical model that accurately predicts the features present in the experimental results.

In the second part of the talk I will present a proposed new route for the sympathetic cooling of a gas of dipolar molecules to ultracold temperatures. Due to their complex rotational, vibrational, and electronic structure collisions between atoms and molecules tend to have large inelastic scattering crosssection. As a result, previous attempts at sympathetic cooling of molecular systems immersed in ultracold atomic gases have had limited success. We propose leveraging the increased elastic scattering rate between molecules and atoms to enhance the cooling rate of a molecular gas. As a proof of principle, we analyze collisions between CH molecules and Li atoms. We predict that the elastic scattering rates between these CH and Li Rydberg atoms are at least two orders of magnitude higher than those of any inelastic process. We estimate that within 5-10 Rydberg atom-molecule collisions, the molecular gas can be cooled to sub-millikelvin temperatures.

Saludos Rosario _______________________________________________ Infoic1 mailing list -- infoic1@onsager.ugr.es To unsubscribe send an email to infoic1-leave@onsager.ugr.es