Consider a Ioffe-Pritchard trap geometry.
Evaporative cooling works by decreasing the trap depth to remove atoms which are more energetic than average; this leads to cooling. This is done by using RF radiation to flip atoms from trapped states ($m_F>0$) to untrapped states ($m_F\leq 0$). My question is about these transitions and the selection rules. The alkalis from which BECs are formed are quasi single electron atoms therefore we expect the single electron jump condition $\Delta l=\pm 1$ to mean that these transitions ($|F,m_F\rangle\rightarrow|F,m_F'\rangle$) are not dipole allowed. Is this the case? Are we, by saying that such transitions can occur, outside of the realm of Russel-Saunders coupling?