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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 48, Number 4
JKCSEZ 48(4)
August 20, 2004 
 
Title
 Equilibrium Structure for CClF3 Using Real-Time and Time-Resolved Gas Electron Diffraction

시간 분해능 전자회절 분광법을 이용한 CClF3분자의 평형 구조 연구
Author
 Seong S. Seo, John D. Ewbank

Seong S. Seo, John D. Ewbank
Keywords
 분자 구조, 시간분해능 전자회절 분광법, 기체 전자회절 분광법 , Molecular Structure, Time-Resolved Electron Diffraction, Gas Electron Diffraction
Abstract
 피코초 시간분해능 전자 회절 분광법(TRED)을 이용하여 CClF3 분자의 평형 구조를 연구하였다. 이 분광법의 분해능은 전자파의 선폭에 의하여 결정된다. 본 연구 방법에 의하여 결정된 CClF3 분자의 결합 길이들을 고전적인 실시간 전자회절 분광법(GED/RT)에 의하여 보고된 결과들과 비교하였다. GED/RT 방법에 의하여 결정된 C-F 결합 길이와 C-Cl 결합 길이는 각각 132.00(2) pm, 175.20(3) pm이고, TRED 방법에 의하여 결정된 C-F, C-Cl 결합 길이는 각각 132.23(13) pm, 177.23(19) pm 로써 이 두 실험 방법에 의하여 결정된 분자 결합 길이는 좋은 일치성을 보여준다.

The simplified cumulant method was applied to diffraction data of CClF3 to study the equilibrium molecular parameters over a range of temperatures. The molecular parameters of CClF3 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 CClF3 at room temperature. The molecular structural parameters CClF3 from TRED are compared with those from GED/RT. The molecular parameters (re)of bonded C-F and C-Cl for CClF3 by simplified CA are 132.00(2) pm and 175.20(3) pm, respectively, by using GED/RT. From the results of TRED experiments ra for bonded C-F and C-Cl are 132.23(13) pm and 177.23(19) pm.

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