scholarly journals Low pressure gas electron diffraction: An experimental setup and case studies

2020 ◽  
Vol 91 (7) ◽  
pp. 074104
Author(s):  
Yury V. Vishnevskiy ◽  
Sebastian Blomeyer ◽  
Christian G. Reuter
Keyword(s):  
Electron Diffraction ◽  
Case Studies ◽  
Low Pressure ◽  
Gas Electron Diffraction ◽  
Experimental Setup

scholarly journals Low Pressure Gas Electron Diffraction: an Experimental Setup and Case Studies

2020 ◽  
Author(s):  
Yury Vishnevskiy ◽  
Sebastian Blomeyer ◽  
Christian G. Reuter
Keyword(s):  
Electron Diffraction ◽  
Benzoic Acid ◽  
Low Pressure ◽  
Molecular Structures ◽  
Gas Electron Diffraction ◽  
Experimental Setup ◽  
Critical Comparison ◽  
Diffraction Patterns ◽  
Predicted Values ◽  
Semi Empirical

<div>Principles of low pressure gas electron diffraction(LPGED) are introduced. An experimental setup has</div><div>been constructed for measuring electron diffraction patterns of gaseous samples at pressures below 10−3</div><div>mbar. Test measurements have been performed for benzoic acid at T = 287 K corresponding to a vapor </div><div>pressure of the substance P = 2 × 10−4 mbar, for iodoform CHI3 at T = 288 K (P = 4 × 10−4 mbar) and for carbon tetraiodide CI4 at T = 290K (P = 1 × 10−4 mbar). Due to the low experimental temperature thermal decomposition of CI4 has been prevented, which was unavoidable in previous classical measurements at higher temperatures.</div><div>From the obtained data the molecular structures have been successfully refined. The most important</div><div>semi-empirical equilibrium molecular parameters are re(Car–Car)av = 1.387(5) Å in benzoic acid, re(C–I)</div><div>= 2.123(3) Å in iodoform and re(C–I) = 2.133(7) Å in carbon tetraiodide. The determined parameters</div><div>showed consistency with theoretically predicted values. A critical comparison with results of the earlier</div><div>investigations has also been done.</div>

scholarly journals Low Pressure Gas Electron Diffraction: an Experimental Setup and Case Studies

2020 ◽  
Author(s):  
Yury Vishnevskiy ◽  
Sebastian Blomeyer ◽  
Christian G. Reuter
Keyword(s):  
Electron Diffraction ◽  
Benzoic Acid ◽  
Low Pressure ◽  
Molecular Structures ◽  
Gas Electron Diffraction ◽  
Experimental Setup ◽  
Critical Comparison ◽  
Diffraction Patterns ◽  
Predicted Values ◽  
Semi Empirical

<div>Principles of low pressure gas electron diffraction(LPGED) are introduced. An experimental setup has</div><div>been constructed for measuring electron diffraction patterns of gaseous samples at pressures below 10−3</div><div>mbar. Test measurements have been performed for benzoic acid at T = 287 K corresponding to a vapor </div><div>pressure of the substance P = 2 × 10−4 mbar, for iodoform CHI3 at T = 288 K (P = 4 × 10−4 mbar) and for carbon tetraiodide CI4 at T = 290K (P = 1 × 10−4 mbar). Due to the low experimental temperature thermal decomposition of CI4 has been prevented, which was unavoidable in previous classical measurements at higher temperatures.</div><div>From the obtained data the molecular structures have been successfully refined. The most important</div><div>semi-empirical equilibrium molecular parameters are re(Car–Car)av = 1.387(5) Å in benzoic acid, re(C–I)</div><div>= 2.123(3) Å in iodoform and re(C–I) = 2.133(7) Å in carbon tetraiodide. The determined parameters</div><div>showed consistency with theoretically predicted values. A critical comparison with results of the earlier</div><div>investigations has also been done.</div>

Combined gas electron diffraction and mass spectrometric experimental setup at Bielefeld University

2020 ◽  
Vol 91 (7) ◽  
pp. 073103
Author(s):  
Yury V. Vishnevskiy ◽  
Sebastian Blomeyer ◽  
Christian G. Reuter ◽  
Oleg A. Pimenov ◽  
Sergey A. Shlykov
Keyword(s):  
Electron Diffraction ◽  
Mass Spectrometric ◽  
Gas Electron Diffraction ◽  
Experimental Setup

scholarly journals Combined Gas Electron Diffraction and Mass Spectrometric Experimental Setup at Bielefeld University

2020 ◽  
Author(s):  
Yury Vishnevskiy ◽  
Sebastian Blomeyer ◽  
Christian G. Reuter ◽  
Oleg A. Pimenov ◽  
Sergey A. Shlykov
Keyword(s):  
Acetic Acid ◽  
Electron Diffraction ◽  
Mass Spectra ◽  
Data Interpretation ◽  
Molecular Structures ◽  
Gas Electron Diffraction ◽  
Electron Diffraction Data ◽  
Experimental Setup ◽  
Experimental Conditions ◽  
Diffraction Patterns

We have designed and constructed a combined experimental setup for synchronous measurements of electron diffraction patterns and mass-spectra of gas samples. Test measurements have been performed for acetic acid at two temperatures, 296 and 457 K, respectively. Electron diffraction data have been analysed taking into account mass spectra measured in the same experiments. From the diffraction intensities molecular structures and mole fractions of the acetic acid monomer and dimer have been refined. The obtained results demonstrate the importance of measuring mass spectra in gas electron diffraction experiments. In particular, it is possible to detect the sample decomposition, which can be used for the optimization of experimental conditions and for the data interpretation. The determined in this work length of the hydrogen bond in the acetic acid dimer, re(O<sup>...</sup>H) = 1.657(9) Å, is in good agreement with modern theoretical predictions. We recommend to measure diffraction patterns of acetic acid for the calibration of the sample pressure in the diffraction point.<br>

scholarly journals Combined Gas Electron Diffraction and Mass Spectrometric Experimental Setup at Bielefeld University

2020 ◽  
Author(s):  
Yury Vishnevskiy ◽  
Sebastian Blomeyer ◽  
Christian G. Reuter ◽  
Oleg A. Pimenov ◽  
Sergey A. Shlykov
Keyword(s):  
Acetic Acid ◽  
Electron Diffraction ◽  
Mass Spectra ◽  
Data Interpretation ◽  
Molecular Structures ◽  
Gas Electron Diffraction ◽  
Electron Diffraction Data ◽  
Experimental Setup ◽  
Experimental Conditions ◽  
Diffraction Patterns

We have designed and constructed a combined experimental setup for synchronous measurements of electron diffraction patterns and mass-spectra of gas samples. Test measurements have been performed for acetic acid at two temperatures, 296 and 457 K, respectively. Electron diffraction data have been analysed taking into account mass spectra measured in the same experiments. From the diffraction intensities molecular structures and mole fractions of the acetic acid monomer and dimer have been refined. The obtained results demonstrate the importance of measuring mass spectra in gas electron diffraction experiments. In particular, it is possible to detect the sample decomposition, which can be used for the optimization of experimental conditions and for the data interpretation. The determined in this work length of the hydrogen bond in the acetic acid dimer, re(O<sup>...</sup>H) = 1.657(9) Å, is in good agreement with modern theoretical predictions. We recommend to measure diffraction patterns of acetic acid for the calibration of the sample pressure in the diffraction point.<br>

Geometrical structure of cyclopropane as studied by gas electron diffraction and spectroscopic data

1985 ◽  
Vol 89 (15) ◽  
pp. 3298-3302 ◽  
Author(s):  
Satoshi Yamamoto ◽  
Munetaka Nakata ◽  
Tsutomu Fukuyama ◽  
Kozo Kuchitsu
Keyword(s):  
Electron Diffraction ◽  
Spectroscopic Data ◽  
Geometrical Structure ◽  
Gas Electron Diffraction

Structures of 1,2-dimethylhydrazine conformers as determined by microwave spectroscopy and gas electron diffraction

1981 ◽  
Vol 83 (2) ◽  
pp. 246-249 ◽  
Author(s):  
Munetaka Nakata ◽  
Harutoshi Takeo ◽  
Chi Matsumura ◽  
Kaoru Yamanouchi ◽  
Kozo Kuchitsu ◽  
...  
Keyword(s):  
Electron Diffraction ◽  
Microwave Spectroscopy ◽  
Gas Electron Diffraction
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