Mass spectrometry of metal compounds: II-mass spectrometric studies of [CF<SUB>3</SUB>EMn(CO)<SUB>4</SUB>]<SUB>2</SUB>, [CF<SUB>3</SUB>EFe(CO)<SUB>3</SUB>]<SUB>2</SUB> (E = S, Se), CF<SUB>3</SUB>SeFe(CO)<SUB>2</SUB>C<SUB>5</SUB>H<SUB>5</SUB> andCF<SUB>3</SUB>SCr(NO)<SUB>2</SUB>C<SUB>5</SUB>H<SUB>5</SUB>

The electron impact induced mass spectra of [CF3SMn(CO)4]2, [CF3SeMn(CO)4]2, [CF3SFe(CO)3]2, [CF3SeFe(CO)3]2, CF3SeFe(CO)2C5H5 and CF3SCr(NO)2C5H5 are reported. These compounds exhibit weak molecular ion peaks and undergo preferential loss of CO or NO groups. The CO or NO free fragments suffer typical loss of ECF2(E = S, Se) with the simultaneous shift of F from carbon to metal. The ions [FFeC5H5]+ and [FCrC5H5]+ in the spectra of the cyclopentadienyl compounds prefer expulsion of &#960;-cyclopentadienyls. The pyrolysis effects on the spectra of the compounds have been studied. An increase in temperature eases the expulsion of ECF2 groups from all the compounds and favors the formation of [Fe(C5H5)2]+ and [Cr(C5H5)2]+ in the cyclopentadienyl compounds

An External Beam Irradiation System for Trace Elemental Determination in Liquids

An external beam irradiation facility for direct trace elemental analysis of liquid samples has bean developed at the Variable Energy Cyclotron Centre, Calcutta. The system has been standardized primarily for transition metals, in liquid samples. The system has been found to behave lineraly over a wide range of concentrations. The minimum detection limits (MDL ) were found in the order of 15 -160 ppm in presence of interfering elements and 0.6 -10 ppm in the absence of interfering elements The results were validated by analysing NIST standards