https://doi.org/10.1140/epjd/e2004-00120-5
Collisions between molecules in the J = 0 state
National Institute of Information and Communications Technology,
Koganei, Tokyo 184-8795, Japan
Corresponding author: a kajita@nict.go.jp
Received:
7
May
2003
Revised:
29
July
2004
Published online:
21
September
2004
Collisions between electrostatically trapped molecules in the J=0 state are theoretically investigated. Molecules in this state are advantageous for the evaporative cooling, because inelastic collision is impossible at ultra-low temperature. However, inelastic collision is more significant than elastic collision at high temperature, because the off-diagonal dipole matrix elements are much larger than the diagonal elements. The elastic and inelastic collision cross-sections are calculated under the condition that the collisional kinetic energy is larger than the energy gap between the rotational states. The dependencies of the collision cross-sections on the collisional kinetic energy and molecular constants are examined.
PACS: 31.15.Qg – Molecular dynamics and other numerical methods / 33.80.Ps – Optical cooling of molecules; trapping / 33.90.+h – Other topics in molecular properties and interactions with photons
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2004
