Rovibrational optical cooling of a molecular beam
| Autor: | Pierre Pillet, Anne Cournol, H. Lignier, Daniel Comparat |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Physics
Brightness education.field_of_study Quantum Physics Atomic Physics (physics.atom-ph) Population FOS: Physical sciences Rotational temperature 02 engineering and technology Rotational–vibrational spectroscopy 021001 nanoscience & nanotechnology 01 natural sciences Physics - Atomic Physics Optical pumping 0103 physical sciences Physics::Atomic Physics Atomic physics Physics::Chemical Physics 010306 general physics 0210 nano-technology education Quantum Physics (quant-ph) Molecular beam Beam (structure) Order of magnitude |
| DOI: | 10.48550/arxiv.1709.06797 |
| Popis: | The preparation of molecules in well-defined internal states is essential for various studies in fundamental physics and physical chemistry. It is thus of particular interest to find methods that increase the brightness of molecular beams. Here, we report on rotational and vibrational pumpings of a supersonic beam of barium monofluoride molecules. With respect to previous works, the time scale of optical vibrational pumping has been greatly reduced by enhancing the spectral power density in the vicinity of the appropriate molecular transitions. We demonstrate a complete transfer of the rovibrational populations lying in ${v}^{\ensuremath{''}}=1--3$ into the vibrational ground-state ${v}^{\ensuremath{''}}=0$. Rotational pumping, which requires efficient vibrational pumping, has been also demonstrated. According to a Maxwell-Boltzmann description, the rotational temperature of our sample has been reduced by a factor of $\ensuremath{\sim}8$. In this fashion, the population of the lowest rotational levels increased by more than one order of magnitude. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|