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Digitale Medien

The role of electromagnetic form factors in meson exchange currents (1988)

Singh, S. K. ; Leidemann, W. ; Arenhövel, H.

Springer

The European physical journal 331 (1988), S. 509-518

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ISSN: 1434-601X

Schlagwort(e): 21.40.+d ; 25.30.Fj

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract The question of electromagnetic form factors, i.e. F 1 V versus G E V , to be used in isovector meson exchange currents in nonrelativistic calculations is critically reviewed. None of the various arguments given earlier in favour of F 1 V have been found valid. Furthermore, model dependence of theoretical calculations on deuteron threshold disintegration due to e.m. form factor fits and potential models is found to be substantial. In view of these results, relativistic effects have to be included for a clear understanding of this process in the high momentum transfer region.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01291909

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Digitale Medien

13C Nuclear magnetic resonance spectroscopy of 4-methylcoumarins (4-methyl-2H-1-benzopyran-2-ones) (1988)

Parmar, V. S. ; Singh, S. ; Boll, P. M.

Chichester : Wiley-Blackwell

Organic Magnetic Resonance 26 (1988), S. 430-433

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ISSN: 0749-1581

Schlagwort(e): 13C NMR chemical shifts ; 4-Methylcoumarins ; 4-Methyl-2H-1-benzopyran-2-ones ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: The 13C NMR spectra of 36 differently substituted 4-methylcoumarins (4-methyl-2H-1-benzopyran-2-ones) have been recorded. The effects of an alkyl side-chain at C-3 on the chemical shift values and that of a methoxy or an acetoxy group in place of a hydroxy group have been observed and rationalized. This study may be helpful in the structure elucidation of new and natural 4-methylcoumarins.

Zusätzliches Material: 4 Tab.