Efficient method for quantum calculations of molecule - molecule   scattering properties in a magnetic field
  We show that the cross sections for molecule - molecule collisions in the presence of an external field can be computed efficiently using a total angular momentum basis, defined either in the body-fixed frame or in the space-fixed coordinate system. This method allows for computations with much larger basis sets than previously possible. We present calculations for 15NH - 15NH collisions in a magnetic field. Our results support the conclusion of the previous study that the evaporative cooling of rotationally ground 15NH molecules in a magnetic trap has a prospect of success. 
Y. V. Suleimanov, T. V. Tscherbul, and R. V. Krems
physics.atom-ph physics.chem-ph