Обобщены известные в литературе модели эффективных операторов (гамильтониана и дипольного момента), используемые для описания спектров двухатомных молекул, находящихся в несинглетном состоянии 2П. Приводятся матричные элементы от эффективных операторов, вычисленные в базисе волновых функций, соответствующих a-связи по Гунду.
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