Acta Phys. -Chim. Sin. ›› 1996, Vol. 12 ›› Issue (06): 560-563.doi: 10.3866/PKU.WHXB19960617

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The Measurement of Adiabatic Lonization Potential of Si(CH3)3Cl and Chemical Bond Energies of Si(CH3)3Cl+

Chen Wen-Wu,Sheng Liu-Si,Ding Chuan-Fan,Qi Fei,Zhang Yun-Wu,Kong Fan-Ao   

  1. The State Key Laboratory of Molecular Reaction Dynamics,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100080|National Laboratory of Synchrotron Radiation,University of Science and Technology of China,Hefei 230026
  • Received:1995-10-04 Revised:1995-12-05 Published:1996-06-15
  • Contact: Chen Wen-Wu


The photoionization spectroscopy of Si(CH3)3Cl in the range of 50 -130 nm was studied with synchrotron radiation source. The adiabatic ionization potentials of molecule Si(CH3)3Cl and radical Si(CH3)3 are 10.06 ±0.02 eV and 7.00±0.03 eV respectively. In addition, the appearance potentials of Si(CH3)2Cl+, Si(CH3)3+, SiCl+ and SiCH3+ were determined:
AP(Si(CH3)2Cl+) =10.49±0.02eV, AP(Si(CH3)3+) = 11.91 ±0.02eV
AP(SiCl+) = 18.64 ±0.06eV, AP(SiCH3+)= 18.62 ±0.02eV
From these, some chemical bond energies of Si(CH3)3Cl+ were calculated:
D(Si(CH3)2Cl+ - CH3) =0.43 ±0.02eV, D(Si(CH3)3+ - Cl) = 1.85 ± 0.02eV
D(SiCH3+ - (2CH3 + Cl)) = 8.56 ± 0.06eV, D(SiCH3+ - 2CH3) =6.71±0.06eV
D(SiCl+ - 3CH3) = 8.58 ± 0.06eV, D(SiCl+- 2CH3) = 8.15 ±0.06eV
D(SiCH3+- (CH3 + Cl)) =8.13 ±0.06eV

Key words: Si(CH3)3Cl, Synchrotron radiation, Ultraviolent photoionization, Lonization potential, The dissociated energy of chemical bond