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Computer generated "Quality Index" for the selection of spectra for the inclusion to the NIST/EPA/NIH mass spectral library is abandoned. We have undertaken a program to manually examine all spectra in the database. Suspect spectra are first examined to
Anzor I. Mikaia, Vladimir G. Zaikin, Alexey V. Varlamov, Nikolay A. Prostakov
Fragmentation of derivatives of 9,10-dihydroanthracene and of its heterocyclic analogues containing atoms of O, S, N, P, Si, As, Se and Te at positions 9 and/or 10 is examined. The conditions reviewed are electron impact and chemical ionization in positive
Anzor I. Mikaia, Victor Shevtsov, Sergei Poshivalov, Alexey V. Varlamov
Major fragmentation of dihydrosilaazaanthracenes, contammg an azetidine substituent, spiro-3-lactam ring, or spirotetrahydrofuryl residue at C9 upon electron impact are due to the presence of these rings. The azetidine ring may be eliminated as a radical