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The features of the interstellar classⅡ methanol source reg io ns are grasped. A new pumping mechanism is argued. It can explain the formation of a series of J 0→J -1 E methanol masers and the increase of the maser intensity with J, while the 2 1→3 0A-+ methanol masers are regard ed as driving coherent microwave field.
The features of the interstellar class II methanol source reg io ns are grasped. A new pumping mechanism is argued. It can explain the formation of a series of J 0 → J -1 E methanol masers and the increase of the maser intensity with J, while the 2 1 → 3 0A- + methanol masers are regard ed as driving coherent microwave field.