Equilibrium Structure for CClF 3 Using Real-Time and Time-Resolved Gas Electron Diffraction

The simplified cumulant method was applied to diffraction data of CClF to study the equilibrium molec- ular parameters over a range of temperatures. The molecular parameters of CClF by the simplified cumulant method were compared with those from the traditional method. Also the instrumentation of picosecond time resolved electron diffraction (TRED) and the experimental details are described. The total experimental temporal resolution was discussed in terms of the electron pulse width. The TRED system was applied to study the molecular structures for CClF at room temperature. The molecular structural parameters CClF from TRED are compared with those from GED/RT. The molecular parameters (r )of bonded C-F and C-Cl for CClF by simplified CA are 132.00(2) pm and 175.20(3) pm, respectively, by using GED/ RT. From the results of TRED experiments r for bonded C-F and C-Cl are 132.23(13) pm and 177.23(19) pm.

[1]  Anatoli A. Ischenko,et al.  Tomography of the molecular quantum state by time-resolved electron diffraction , 1999, Other Conferences.

[2]  A. Zewail,et al.  Ultrafast electron diffraction: structures in dissociation dynamics of Fe(CO)5 , 1997 .

[3]  V. Lobastov,et al.  Regular paperStatistical formalism for analysis of gas electron diffraction intensities of Boltzmann vibrational distributions , 1996 .

[4]  V. Lobastov,et al.  Direct Evaluation of Equilibrium Molecular Geometries Using Real-Time Gas Electron Diffraction. 2. Selenium Hexafluoride , 1995 .

[5]  Anatoli A. Ischenko,et al.  Direct Evaluation of Equilibrium Molecular Geometries Using Real-Time Gas Electron Diffraction , 1994 .

[6]  Ahmed H. Zewail,et al.  Ultrafast Electron Diffraction. 5. Experimental Time Resolution and Applications , 1994 .

[7]  A. Zewail,et al.  Ultrafast Electron Diffraction. 4. Molecular Structures and Coherent Dynamics , 1994 .

[8]  Lothar Schäfer,et al.  Instrumentation for gas electron diffraction employing a pulsed electron beam synchronous with photoexcitation , 1992 .

[9]  L. Schäfer,et al.  Real-Time Electron Diffraction. Part III: Image Transfer via Fiber Optics , 1989 .

[10]  V. P. Spiridonov,et al.  The cumulant method in diffraction analysis of polyatomic molecules , 1988 .

[11]  W. Faust,et al.  Improvements in real‐time data acquisition for gas electron diffraction , 1986 .

[12]  Lothar Schäfer,et al.  Real‐time data acquisition for gas electron diffraction , 1984 .

[13]  W. Gentry,et al.  Ten-microsecond pulsed molecular beam source and a fast ionization detector. , 1978, The Review of scientific instruments.

[14]  M. Dakkouri,et al.  On the molecular structure of X-CF3 molecules (X = Cl, Br, I) , 1978 .

[15]  L. Bartell,et al.  Structures of CF3Cl and CH3Cl , 1955 .

[16]  John R. Helliwell,et al.  Time-resolved diffraction , 1997 .

[17]  W. J. Orville-Thomas,et al.  Diffraction studies on non-crystalline substances , 1981 .

[18]  John Robinson Pierce,et al.  Theory and Design of Electron Beams , 1954 .