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Collisions in a Cold Trapped Molecular Sample in a well-defined quantum state: COCOTRAMOS

Grant number: 21/04107-0
Support type:Research Projects - Thematic Grants
Duration: November 01, 2021 - October 31, 2025
Field of knowledge:Physical Sciences and Mathematics - Physics - Atomic and Molecular Physics
Cooperation agreement: ANR
Principal researcher:Luis Gustavo Marcassa
Grantee:Luis Gustavo Marcassa
Principal researcher abroad: BOULOUFA
Institution abroad: Centre National De La Recherche Scientifique, France
Home Institution: Instituto de Física de São Carlos (IFSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
Assoc. researchers:Marcio Heraclyto Gonçalves de Miranda ; Marcos Roberto Cardoso ; Olivier Dulieu ; Romain Vexiau

Abstract

The research field of ultracold (T<<1mK) molecules is continuously expanding in many directions, involving an increasing number of groups throughout the world. Molecules at ultracold temperatures move at very small velocities and thus can be precisely controlled in their quantum state. Unfortunately, until recently, laser cooling could not be applied easily to molecules because they generally do not possess suitable closed optical transitions, like in atomic systems: their complex inner structure, which includes vibration and rotation, prevent them from transferring cooling and slowing devices known from atomic physics, except for a very restricted class of molecular species. This work is a continuation of a successful long collaboration between the Brazilian USP-SC experimental group and the French LAC theoretical team. Together they have made a series of achievements including the successful creation of ultracold ground state rubidium diatomic molecules by short range photoassociation. Four joint scientific papers have been published within this collaboration since 2013. The main goal of the current proposal is to join our efforts to refine laser cooling further and to invent new cooling schemes which take into account the unique features of molecular structure, and produce a dense sample of absolute ground state of cold trapped Rb2 molecules. Once this goal is reached, we intend to study bi-molecular collisions in two directions: first by finding optimal conditions to suppress them by optical shielding, and second to observe molecule-molecule collisions and formation of Rb4 complex. (AU)

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