The use of metastable ions to uniquely identify thiohydantoin derivatives in mixtures has proven useful in the identification of the MTH and PTH derivatives of glycine whose molecular ions are not unique and for resolving such ambiguities as occur for example in the mixture of leucine and ...
it is possible to distinguish the different configurations of the hydroxy steroids of these series on the basis of the CID MIKE spectra of (M H 2O) + ions formed by dehydration of metastable molecular ions in the first field-free region of a reversed geometry double-focusing mass spectrometer...
It has usually been customary to operate mass spectrometers with the filament and electron gun at a positive potential with respect to the analyzer section which is grounded. Under these conditions the ions pass through the exit slit and strike the ion-collector plate with the full energy acquired...
Mass spectrometrymetastable ionsGC/MSMS/MSThree metastable transitions are observed with 31 5-t-butyldimethylsiloxy-dehydrosterone (BDMS-DHEA) by detecting their daughter ion at m/z 269 in a double focussing mass spectrometer. Because of their specificity, the transitions of molecular ion could ...
Mass spectrometrymetastable ionsGC/MSMS/MSThree metastable transitions are observed with 31 5-t-butyldimethylsiloxy-dehydrosterone (BDMS-DHEA) by detecting their daughter ion at m/z 269 in a double focussing mass spectrometer. Because of their specificity, the transitions of molecular ion could ...
By proper adjustment of the sector voltage one can tune in a fragment ion formed in a metastable transition in the region between accelerating field and electric sector and then by scanning the main magnetic field one can observe products of further fragmentation of these ions in the region ...
The mechanism of propene elimination from metastable methyleneimmonium ions is discussed. The first field-free region fragmentations of complete sets of is... HJ Veith,JH Gross - 《Journal of Mass Spectrometry》 被引量: 19发表: 2010年 Theoretical calculation of isotope effects, kinetic energy rel...
Distorted peak shapes observed in 252Cf fission fragment ionization mass spectrometry using time-of-flight mass spectrometers are shown to result from delayed dissociations of initial ions. Decompositions occurring in the ion acceleration region produce tails on parent or fragment ion peaks, and ...
The ionization sources commonly used in mass spectrometry, such as CI and EI, can cause fragmentation during the ionization process. Fragmentation decreases the sensitivity of the molecular ions and increases the risks of interferences with the compounds coming from the matrix. An energy-tunable ...
In summary, we revealed that excessive hydration reconstruction of the surface will corrode the surface of the oxide photoanode with the corrosion of Cl−ions in the solution. The anchoring of the surface lattice by Sn hinders the transfer of protons to lattice oxygen, and the probability of ...