Citation:
	            
		            Huang  Rong-Bin, Zhang  Peng, Li  Wen-Ying, Su  Jian-Rui, Zheng  Lan-Sun. Mass Spectrometry of Laser Generated Positive and Negative Phosphrus Cluster Ions[J]. Acta Physico-Chimica Sinica,
							;1991, 7(06): 646-647.
						
							doi:
								10.3866/PKU.WHXB19910602
						
					
				
					
				
	        
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	                	Both positive and negative phosphrus cluster ions were generated on a homemade laser-probe time-of-flight mass spectrometer. P_6~+ has the highest intensity in positive ion mass spectrum, and P_5~- for negative ions. It is proposed that both P_6~+ and P_5~- adopt the planar monocyclic configuration and are aromatic according to Hückel Rule. Further analysis of mass spectra shows that all cluster anions are composed of 5-membered rings and cations arc composed of 6-membered rings.
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