Acta Phys. -Chim. Sin. ›› 1998, Vol. 14 ›› Issue (11): 1007-1012.doi: 10.3866/PKU.WHXB19981109

• ARTICLE • Previous Articles     Next Articles

The Multiphoton Dissociation and lonization of CS2 in the Range 242-260nm

Zhang Li-Min, Chen Jun, Dai Jing-Hua, Wang Chu-Ji, Zhang  Tao, Chen Cong-Xiang, Ma Xing-Xiao   

  1. Laboratory for Bond-selective Chemistry,Academy Sinica;Departmetn of Chemical Physics,University of Science and Technology of China,Hefei 230026
  • Received:1998-01-12 Revised:1998-05-25 Published:1998-11-15
  • Contact: Zhang Li-Min

Abstract:

 The mass-selected excitation spectra for parent ion CS and the fragmentation ions CS+, S+ and C+ are obtained by using the resonance-enhanced multiphoton ionization (REMPI)of CS2 in the range 242 260nm. It is shown that the diffuse bands of CS in range of λ<246.4nm are mainly from the two-photon ionization of CS2. It has been reasonably assumed from the assignments of excitation spectra for the fragments that the neutral CS and S are produced by the photodissociation of CS2 in the process, that is, (1) the bands of CS+ are mainly due to the (1+1) resonance-enhanced ionization via the one-photon transition of the fragment CS, (2) besides part of S+ spectral peaks are from the dissociation of CS+, most of S+ spectral peaks are due to the (2+1) resonance-enhanced ionization via the two-photon transition 3p3 (2D0) 4p, 3p3 (4S0) np (n=6,7,8)←3p4 3PJ (J=2,1,0) of S atoms.

Key words: CS2, Photodissociation, CS fragmentation, S atom