Building on recent advances in ultrafast lasers and methods to slow molecules, an experiment is proposed to produce translationally cold CO 2 super-rotors (j∼200) by combining an optical centrifuge with helium-buffer-gas cooling. Quantum mechanical calculations of the complex scattering length for He-CO2 collisions demonstrate that the efficiency of rotational quenching decreases rapidly with increasing rotational excitation j in the ultracold regime. Extrapolating to helium cryogenic temperatures, rotational quenching is predicted to remain inefficient up to ∼1 K, allowing for the possible creation of a beam of translationally cold, rotationally hot molecules.
|Original language||English (US)|
|Journal||Physical Review A - Atomic, Molecular, and Optical Physics|
|State||Published - Nov 1 2011|
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics