Citation:
	            
		            LI  Xiao-Yan, ZENG  Yan-Li, MENG  Ling-Peng, ZHENG  Shi-Jun. Reaction Mechanisms of HCHO+X(X=F, Cl, Br)[J]. Acta Physico-Chimica Sinica,
							;2008, 24(11): 2053-2058.
						
							doi:
								10.3866/PKU.WHXB20081120
						
					
				
					
				
	        
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	                	The reactions of HCHO+X (X=F, Cl, Br) were studied at CCSD/6-311++G(d,p)//B3LYP/6-311++G (d,p) level. The computational results show that the reaction channel of halogen atom X (X=F, Cl, Br) which gains H atom of the HCHOto get HCO+HX(X=F, Cl, Br) is the main reaction channel. Except this reaction channel, a stable complex forms firstly, then the complex via two channels to get the products, one is that the halogen atom gains a hydrogen from HCHO to form HCO+HX(X=F, Cl, Br) and the other is that the complex decomposes directly to H and XCHO (X=F, Cl, Br). The first channel is the main channel and the HCO+HX(X=F, Cl, Br) are the main products. Furthermore, because the energy barriers of the three reactions are low, these reactions could occur easily. The topological analysis of electron density shows that there is a T-shape structure transition state (STS) in the channel (b) of HCHO+X reaction, the STS appears later than the energy transition state (ETS). And the STS appears later and later in the sequence of F, Cl, Br.
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