摘要:

The mean positions and apparent extinction coefficients of the ring stretching bands near 1600 cm−1in the IR spectra of trans azobenzene and some substituted trans azobenzenes are reported. These results are discussed in relation to values reported for substituted benzenes.

ISSN:0038-7010    

DOI:10.1080/00387017308060848

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

The electronic absorption spectrum of mesitylene vapour has been photographed on a Q-24 Medium Quartz Spectrograph. The molecule belongs to D3hsymmetry and the transition is A→1A2which is forbidden and due to that the (0,0) band does not appear in the spectrum. The position of (0,0) band in this case has been fixed at 36562 cm−1with the help of 0→1 and 1→0 transitions. There are 66 bands and most of them are assigned in terms of two ground state frequencies of magnitudes 278 and 519 cm−1and 7 excited state frequencies of magnitudes 267, 436, 554, 968, 1268, 1386 and 1575 cm−1

ISSN:0038-7010    

DOI:10.1080/00387017308060849

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

Intramolecular rearrangement processes in the mass spectra of trimethylsilyl derivatives of hydroxy steroids are discussed in terms of the reaction of a siliconium center and a heteroatom. The reaction is shown to be stereospecific. The reactivity of siliconium cations also results in the occurrence of intermolecular reactions under electron impact ionization conditions. Tetramethylsilane is used as a precursor for the production of siliconium ions and examples of chemical ionization mass spectra employing this reagent are shown.

ISSN:0038-7010    

DOI:10.1080/00387017308060850

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

The microwave band spectra1of asymmetric top molecules have 2J + 1 distinct rotational energy sublevels for each value of rotational quantum nuqber J. Through application of group theory, the statimary states of rigid asymmetric rotors can be classified by the irreducible representations or by the symmetry species of the V(D2) point group (the Four-group). When performing a Wang syrnrnetrizing transformation2on the original energy matrix E(K) where k is the Raj's asymmetry parameter: a new energy matrix E'(K) may be readily obtained.

ISSN:0038-7010    

DOI:10.1080/00387017308060851

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

U.v spectra study of phosphacgclic compounds with tetracoordinated ring phosphorus atom has been an object of a rather limited number of WOZkS. There are only few works on U.V. absorption spectra of cyclic phosphonitriles which reveal a specifio character of their Π-electronic structure1; besides, there are some data on a significant low - frequency shifting of the electronic spectrum of 1.1 - diphenylphos-phabemene against that of benzene2. This communication presents an analyisis of the experimental findings on electronic absorption spectra of a Wide variety of substituted phospha-pyrimidines, PhP, (1,2,6 - phosphadiazines) for elucidating the nature of the observed absorption ban and for studying electronic distribution as well as separate characteristics of the php moLecules in the ground and excited states.

ISSN:0038-7010    

DOI:10.1080/00387017308060852

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

An extensive calculation was carried out using the precisely measured value of the Q-band heads and the following molecular constants for the C2π12and the X2σ states, which are responsible for the Green Band System of BaF, were determined.

ISSN:0038-7010    

DOI:10.1080/00387017308060853

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

The preferential excitation of AsO in a chemiluminescent reaction of AsCI3+ O2K has been discussed. On the basis of the observed v1= 2 level of AsO in the energy state A2σ the dissociation energy of AsCl has been estimated and was found to be 86.8 K Cal/mole.

ISSN:0038-7010    

DOI:10.1080/00387017308060854

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

ISSN:0038-7010    

DOI:10.1080/00387017308060855

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue.

ISSN:0038-7010    

DOI:10.1080/00387017308060847

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor