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| 11. |
Molecular Structures of Ethylene, Allene and Ethylene Oxide and Bridged π-Bond |
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Spectroscopy Letters,
Volume 22,
Issue 8,
1989,
Page 1093-1100
Keinosuke Hamada,
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摘要:
Valence considerations suggest the plane symmetrical form (point group D2h) for an ethylene molecule. The observed spectra show that there are no bands that occur in the Raman as well as the infrared spectrum of an ethylene gas, proving that the molecule has D2hsymmetry where the molecule has a center of symmetry. From valence theory one would expect for an allene molecule that the C = C = C chain is linear but that the two CH2groups lie in planes at right angles to each other and passing through the C = C = C axis, that is, that the molecule belongs to point groups D2d. The obtained Raman and infrared data of an allene can be interpreted according to D2dsymmetry.
ISSN:0038-7010
DOI:10.1080/00387018908053960
出版商:Taylor & Francis Group
年代:1989
数据来源: Taylor
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| 12. |
On the Charge Distribution in the Bis (Triphenylphosphoranylidene) Ammonium (PPN+) Ion |
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Spectroscopy Letters,
Volume 22,
Issue 8,
1989,
Page 1101-1110
Anders Widelöv,
Börje Folkesson,
Carlaxel Andersson,
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摘要:
IR intensity and ESCA measurements have been used to determine the distribution of atomic charges in the bis (triphenylphosphoranylidene) ammonium ion. The central nitrogen atom has a charge of -0.5 whereas the two phosphorous atoms have positive charge (+0.9). From the IR intensity data and13C-NMR parameters it was possible to estimate the charge of each phenyl group. The result (-0.05 a.u.) is in good agreement with the result from the ESCA investigation.
ISSN:0038-7010
DOI:10.1080/00387018908053961
出版商:Taylor & Francis Group
年代:1989
数据来源: Taylor
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| 13. |
Studies on Temporal Resolution Characteristics of Flame Temperature for Flame Atomic Absorption Spectroscopy |
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Spectroscopy Letters,
Volume 22,
Issue 8,
1989,
Page 1111-1122
Junde Wang,
Hongzhi Li,
Zouru Chen,
Houqian Xu,
Yunhau Lou,
Jianguo Guo,
Xuemei Wang,
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摘要:
In this paper we report a method and experiment system developed by us to useful for temporal and spatial temperature distribution of the flame for atomic obsorption spectroscopy in detail. The method and system principle is based on the modified sodium line reversal method. The studies on temporal (20–50 μsec range) and spatial (π 1mm) resolution of the flame temperature aim at establishing optimum analysis conditions and improving analysis characteristics of flame atomic absorption/emission spectroscopy.
ISSN:0038-7010
DOI:10.1080/00387018908053962
出版商:Taylor & Francis Group
年代:1989
数据来源: Taylor
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| 14. |
Erratum |
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Spectroscopy Letters,
Volume 22,
Issue 8,
1989,
Page 1125-1125
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ISSN:0038-7010
DOI:10.1080/00387018908053963
出版商:Taylor & Francis Group
年代:1989
数据来源: Taylor
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| 15. |
Editorial board page for “Spectroscopy Letters”, Volume 22, Number 8 |
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Spectroscopy Letters,
Volume 22,
Issue 8,
1989,
Page -
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PDF (46KB)
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摘要:
This is a scanned image of the original Editorial Board page(s) for this issue.
ISSN:0038-7010
DOI:10.1080/00387018908053949
出版商:Taylor & Francis Group
年代:1989
数据来源: Taylor
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