Table 2.

Matrix elements (in units of cm⁻¹) of the one‐electron Breit–Pauli Operator of the SOC between S₁ and the lowest two triplet states.^[a]

	helical‐BDP			BDP
SOC states	C 2V	C 2	CS	C 2V
S1/T1	0	0.0977 x	0.0024 z	0
S1/T2	0	0.1689 x	0.0781 z	0

[a] Each value is labeled with the index (x, y, z) of the triplet sublevel. In both helical‐BDP and BDP, SOC is forbidden by symmetry in the structures with C _2v point group (see Supporting Information for details).