From Mass Spectrometry: A Foundation Course
ADC

analog-to-digital converter

AE

appearance energy

AMS

accelerator mass spectrometry

amu

atomic mass unit, now u

AP

appearance potential

APCI

atmospheric-pressure chemical ionisation

B

magnetic sector mass analyser; magnetic field strength (in italics)

B/E

magnetic sector linked scan constant for fragment ions

B 2/E

magnetic sector linked scan constant for precursor or parent ions

CA

collisional activation

CAD

collisionally activated dissociation

CE

capillary electrophoresis

CF-FAB

continuous-flow fast atom (or ion) bombardment

CI

chemical ionisation

CID

collision-induced dissociation

CR

charge reversal

Da

Dalton

DE

delayed extraction, also time-lag focusing (TLF)

E

electric sector mass analyser; electric sector voltage

EA

electron affinity

ECD

electron-capture dissociation

EE

even-electron ion

EI

electron ionisation; electron impact

EM

electron multiplier

ESI

electrospray ionisation

ESI-MS or ESIMS

electrospray ionisation mass spectrum, spectrometry or spectrometer

e

charge of an electron; one electron has a charge of 1.602 10 ?19 Coulombs (C)

eV

electron volt

FA

flowing afterglow

FAB

fast-atom bombardment

FD

field desorption

FFR

field free region

FT-ICR

Fourier-transform ion cyclotron resonance, also FT-MS

FWHM

full-width at half maximum

GC

gas chromatography or chromatograph

GC-MS

gas chromatography-mass spectrometry

ICP-MS

inductively coupled plasma mass spectrometry

ICR

ion cyclotron resonance

IE

ionisation energy

IMS

ion mobility spectrometry

IT

ion trap, also quadrupole ion trap (QIT)

Copyright The Royal Society of Chemistry 2004 under license agreement with Books24x7

Products & Services
Mass Spectrometers
Mass spectrometers separate ions by their mass-to-charge (m/z) ratios. They are used to identify compounds by the mass of one or more elements in the compound. They are also used to determine the isotopic composition of one or more elements in a compound.
Residual Gas Analyzers
Residual gas analyzers (RGAs) identify the gases present in vacuum environments.
Volatile Organic Compounds (VOC) Analyzers
Volatile organic compound (VOC) analyzers are used to detect concentrations of heavy hydrocarbons in gas or liquid media.
Ion Beam Guns and Electron Beam Guns
Ion beam guns and electron beam guns produce beams of electrons, ions or other particles for use in chemical and surface analysis, particle physics, resin curing or semiconductor manufacturing.
Environmental Testing and Analysis Services
Environmental testing and analytical services provide testing of environmental samples such as soil, water, air, and industrial wastes or byproducts.

Topics of Interest

Isotope Nominal mass Mass Relative abundance 1H 1 1.007825032 99.985(1) 2H; D 2 2.014101778 0.015(1) 3H; T 3 3.016049268 <0.0001 4He 4 4.002603250 ~100 6Li 6 6.0151223 7.5(2) 7Li 7 7.0160041...

AA Atomic absorption AAS Atomic absorption spectrometry/spectrometers ABS Acrylonitrile butadiene styrene terpolymers ADC Analogue-to-digital converter AES Auger electron spectroscopy AFM...

[concs] Concentrations AAS Atomic absorption spectrometry ABS Acrylonitrile-butadiene-styrene AC Alternating current AC Atomic composition AED Atomic emission detector AFS Atomic fluorescence...

AAS atomic absorption spectrometry ABE allyl butyl ether ABS acrylonitrile-butadiene-styrene terpolymer AFS atomic force microscopy AIBN azobisisobutyronitrile AES auger electron spectroscopy AFM...

4.1 BASIC PRINCIPLES; PRECURSOR AND FRAGMENT IONS With the exception of electron ionisation, all of the ionisation methods described in Section 3.2 lead to the formation of molecular ions (or...