The photodissociation dynamics of dibromobenzenes and tribromobenzene in the gas phase studied with femtosecond pump–probe spectroscopy

✍ Scribed by Malin Kadi; Jan Davidsson

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 192 KB
• Volume: 378
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/s0009-2614(03)01271-5

✦ Synopsis

The photodissociation dynamics of o-, m-, p-dibromobenzene and 1,3,5-tribromobenzene have been investigated in a molecular beam following excitation at 266 nm using ultrafast spectroscopy. In o-and m-dibromobenzene two dissociation pathways have been observed, whereas p-dibromobenzene and 1,3,5-tribromobenzene dissociates via one channel. The channel common for all the compounds has been assigned to predissociation from 1 (p; p à ) state to the repulsive 3 (n; r à ) state. The rate of this process increases with the number of bromine atoms and with decreasing distance on the phenyl ring. The presence of two dissociation channels in o-and m-dibromobenzene is probably related to the lower symmetry of these molecules.