- sigma and pi couplings
- Смотри Сигма (σ) — и пи (π) — связи.
Энциклопедический словарь по металлургии. — М.: Интермет Инжиниринг. Главный редактор Н.П. Лякишев. 2000.
Энциклопедический словарь по металлургии. — М.: Интермет Инжиниринг. Главный редактор Н.П. Лякишев. 2000.
Сигма (σ) — и пи (π) — связи — [sigma and pi couplings] ковалентное химическое свойство, характеризующееся определенной, но разной пространственной симметрией распределения электронной плотности. Результирующее электронное облако σ связи симметрично относительно линии связи,… … Энциклопедический словарь по металлургии
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