Low-voltage (14 eV) mass spectra normalized and isotopically corrected.Sample 71-511-37-1 Cu porphyrins also contained C22(24) and C23(74) members in the amounts indicated in parentheses.
Values are normalized, using absorption values at chlorin red maxima. Equal extinction of chlorin species is assumed, ind. = indicated from spectra of mixtures; +, ++ = present, relative downhole rela