What are the rulings concerning the waiting period (iddah) of a wife whose husband abandoned her for a year, then divorced her with an irrevocable divorce?

The 'iddah (waiting period) is obligatory for a wife with whom conjugal relations have been established. Her 'iddah begins from the date of divorce. Its obligation is not nullified by the husband's abandonment of his wife, because the marital bond remains intact despite the abandonment. The 'iddah varies depending on the woman's circumstances.