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

Grant number: 21/04107-0
Support Opportunities:Research Projects - Thematic Grants
Duration: November 01, 2021 - October 31, 2025
Field of knowledge:Physical Sciences and Mathematics - Physics - Atomic and Molecular Physics
Convênio/Acordo: ANR
Principal Investigator:Luis Gustavo Marcassa
Grantee:Luis Gustavo Marcassa
Principal researcher abroad: Nadia Bouloufa-Maafa
Institution abroad: Laboratoire Aimé Cotton, France
Host Institution: Instituto de Física de São Carlos (IFSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
Associated researchers:Marcio Heraclyto Gonçalves de Miranda ; Marcos Roberto Cardoso ; Olivier Dulieu ; Romain Vexiau
Associated scholarship(s):23/06732-5 - Broadband laser spectral control for pumping cold molecules, BP.MS
22/16904-5 - Production and manipulation of cold molecules, BP.DR


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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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
TORRES, MANUEL ALEJANDRO LEFRAN; FERNANDEZ, DAVID RODRIGUEZ; CARDOSO, MARCOS ROBERTO; MARCASSA, LUIS GUSTAVO. High resolution laser spectroscopy of iodine molecule in the 14 600-14 710 cm(-1) range. JOURNAL OF MOLECULAR SPECTROSCOPY, v. 387, p. 4-pg., . (18/06835-0, 19/10971-0, 19/23510-0, 21/04107-0)
FERNANDEZ, DAVID RODRIGUEZ; LEFRAN TORRES, MANUEL ALEJANDRO; CARDOSO, MARCOS ROBERTO; MASSAYUKI KONDO, JORGE DOUGLAS; MARCASSA, LUIS GUSTAVO. High resolution laser spectroscopy of iodine molecule in the 14400-14600 cm-1 range. JOURNAL OF MOLECULAR SPECTROSCOPY, v. 395, p. 5-pg., . (19/23510-0, 19/10971-0, 21/04107-0, 18/06835-0)
TORRES, MANUEL ALEJANDRO LEFRAN; PASSAGEM, HENRY FERNANDES; FERNANDEZ, DAVID RODRIGUEZ; DA COSTA PAUL, EDUARDO; CASIQUE, CRISTIAN ADAN MOJICA; DULIEU, OLIVIER; BOULOUFA-MAAFA, NADIA; MARCASSA, LUIS GUSTAVO. Proposal for Zeeman slowing of Rb-2 molecules in a supersonic beam, inducing internal cooling. JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, v. 56, n. 6, p. 10-pg., . (19/23510-0, 19/10971-0, 21/04107-0, 18/06835-0)

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