mass spectrum
111Four-momentum — In special relativity, four momentum is the generalization of the classical three dimensional momentum to four dimensional spacetime. Momentum is a vector in three dimensions; similarly four momentum is a four vector in spacetime. The… …
112Nitrogen rule — The nitrogen rule states that organic compounds containing exclusively hydrogen, carbon, nitrogen, oxygen, silicon, phosphorus, sulfur, and the halogens either have 1) an odd nominal mass that indicates an odd number of nitrogen atoms are present …
113Matrix-assisted laser desorption electrospray ionization — Schematic of a typical MALDESI setup Matrix assisted laser desorption electrospray ionization (MALDESI) is a method for creating ions that can be used for chemical analysis in a mass spectrometer.[1] It is related to desorption electrospray… …
114RFQ Beam Coolers — RFQ stands for Radio Frequency Quadrupole (also known as a Quadrupole mass analyzer when used as a mass filter), an instrument that is used in mass spectrometry. The RFQ was invented by Prof. Wolfgang Paul in the late 50 s / early 60 s at the… …
115Desorption electrospray ionization — (DESI) Acronym DESI Classification Mass spectrometry Analytes Organic molecules Biomolecules Other techniques Related Electrospray ionization Atmospheric pressure chemical ionization …
116Penning trap — Penning traps are devices for the storage of charged particles using a constant static magnetic field and a spatially inhomogeneous static electric field. This kind of trap is particularly well suited to precision measurements of properties of… …
117Daly detector — Schematic of a Daly detector Inventor Norman Richard Daly Related items Microchannel plate detector Electron multiplier A Daly detector is a gas phase ion detector that consists of a metal doorknob , a …
118Quarkonium — In particle physics, quarkonium (pl. quarkonia) designates a flavorless meson whose constituents are a quark and its own antiquark. Examples of quarkonia are the J/ψ meson (an example of charmonium, cc) and the ϒ meson (bottomonium, bb). Because… …
119Protein sequencing — Proteins are found in every cell and are essential to every biological process, protein structure is very complex: determining a protein s structure involves first protein sequencing determining the amino acid sequences of its constituent… …
120Collision-induced dissociation — In Mass spectrometry, Collision induced dissociation (CID), referred to by some as collisionally activated dissociation (CAD), is a mechanism by which to fragment molecular ions in the gas phase. The molecular ions are usually accelerated by some …
