By 355 nm laser ablating a composite target prepared from metallic lithium and ZnO in high vaccum, a new hypermetallic oxide LiZnO+ ion, which consists of two heterometal atoms and oxygen atom, was observed by using a time-of-flight mass spectrometer for the first time. The time-of-flight positive ion mass spectra at different delay time between the accelerated electric field and laser pulse are investigated. It shows that the formation of LiOZn+ depends on the delay time, and the hypervalent ion LiOZn+ is observed obviously at the delay time from 7.5 to 17.5 μs. These results suggest that the ion-molecular reaction between the ablated Li+ ions and ZnO in the laser plasma should be responsible for the formation of hypermetallic LiZ nO+.
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