In mass spectrometry: Magnetic field analysis …peak is known as a metastable peak. Generally, metastable peaks occur at nonintegral mass numbers, and, because there usually is a kinetic energy of separation during fragmentation of the polyatomic ion, they tend to be more diffuse than the normal...
Chemical ionization of methanol with H 3 + was used to produce excited protonated methanol ions, m/e = 33, for which metastables were observed for decomposition to protonated formaldehyde ( m/e = 31) and methyl cations ( m/e = 15): The metastable peak for 33 → 31 is broad and X...
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 ...
Yen, T.F., 1976, Structural investigation of Green River shale kerogen, in:“Science and Technology of Oil Shale,” T.F. Yen, ed., Ann Arbor Science, Michigan. About this Chapter Title Pyrolysis/High Resolution Mass Spectrometry with Metastable Peak Monitoring Applied to the Analysis of Gre...
The metastable peak resulting from the fragmentation of [C 7 H 7 ] 2+ ions fram a variety of sources shows structure due to the presence of two reactions releasing different amounts of translational energy. The translational energy differences has been measured as 0.52 ± 0.04eV and is thought...
peak of oxygen shifts to the direction of high energy, which reflects that the addition of Sn effectively improves the bonding energy of O in the lattice. A shoulder peak at 532.3 eV corresponds to the contribution of the Sn 5sorbit29,30. This shows that the Sn atoms dispersed in ...
each oscillation cycle was accompanied by a negative temperature peak of∼1 K that coincided with the maximum of the oxide coverage. Compared with the other gas products, the periodicity and productivity of water were not pronounced. We detected only a slight increase in its signal during the...
Petersen,A Christian - 《Journal of Mass Spectrometry》 被引量: 0发表: 2017年 Kinetic energy release distributions in mass spectrometry potential energy surfaces; (3) the kinetic energy release distribution (KERD); (4) metastable peak observations: measurements on magnetic sector and time-... J...
Subsequent fragmentations were studied using mass analyzed ion kinetic energy spectrometry. Decomposition pathways consistent with experimental collision induced dissociation peak shapes and ab initio potential diagrams are presented for the fragmentation of Ar2+ and N4+. Mechanisms for the collision induced...
The scope of metastable peak observations Other topics discussed include composite metastable peaks, metastable peaks produced in chemical ionization and field ionization and the partitioning of internal energy of the fragmenting ion into translational degrees of freedom of the products... JL Holmes,JK ...