Knowledge Bank

The magnetic field effect on the relative pumping rates for the lowest triplet zero-field Levels is used to elucidate the intersystem crossing mechanism. From the zero-field relative pumping rates, the magnetic field effects on these relative rates can be calculated for the direct process $(S1\to T1)$. Agreement between the calculated and observed effects would confirm the $S1\to T1$ mechanism, while disagreement would suggest an $S1\to$ higher triplet mechanism. The 2,3-dichloroquinoxaline system is studied and will be discussed.