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Citation: Tang Ying, Ji Lei, Tang Bi-Feng, Zhu Rong-Shu, Zhang Song, Zhang Bing. Photodissociation of Alkyl Bromides at UV Scope[J]. Acta Physico-Chimica Sinica, ;2004, 20(04): 344-349. doi: 10.3866/PKU.WHXB20040402 shu

Photodissociation of Alkyl Bromides at UV Scope

1.
State Key Laboratory of Magnetic Resonance and Atomic Molecular Physics, Wuhan Institute of Physics and Mathematics, Wuhan　430071

Received Date: 11 September 2003
Available Online: 15 April 2004

Some alkyl bromides (CHBr3, CH2Br2, C2H5Br, C2H4Br2) have been studied at 234 nm and 267 nm in the time-of-flight mass spectrometer by means of multiphoton dissociation and ionization. Under the radiation of UV laser, alkyl bromides are photolyzed after absorbing one photon, release Br atoms, absorbing photons continuously, and (2＋1)resonance-enhanced multiphoton ionization of Br atoms takes place. The Br atoms from the dissociation of the bromides are probably at the ground state Br(2P03/2) or at the excitated state Br*(2P01/2),and the branching ratio of Br atom N(Br*)/N(Br) is obtained. We find that the branching ratio at 267 nm is obviously bigger than the result at 234 nm. After discussing the mechanics of the multiphoton process, we conclude that the change tendency of the branching ratio with the wavelength is due to the different dissociation channels.
- Alkyl bromide;REMPI (resonance-enhanced multiphoton ionization);TOF-MS (time-of- flight mass spectrometer);Branching ratio
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