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NH_3/He混合气在超声分子束中形成分子簇,在427～442nm可见区用激光进行多光子电离,用飞行时间质谱仪检测到氨分子簇离子,最大的合17个N原子。除了质子化离子(NH_3)_nH~+之外,还有(NH_3)_n~+(NH_3)_nH_2~+和(NH_3)_(n-1)NH_2~+。离子强度的分布在较短波长和较长波长处有所不同。本文讨论了以上团簇离子形成的可能机理。
The NH3 / He mixture forms molecular clusters in the ultrasonic molecular beam, and multiphoton ionization is performed by laser in the visible region of 427 nm to 442 nm. Ammonion cluster ions (up to 17 N atoms) are detected by time-of-flight mass spectrometry. In addition to protonated ion (NH_3) _nH ~ +, there are (NH_3) _n ~ + (NH_3) _nH_2 ~ + and (NH_3) _ (n-1) NH_2 ~ +. The distribution of ionic strength is different at shorter and longer wavelengths. This article discusses the possible mechanism for the formation of the above cluster ions.