What is a fragment ion peak?
A term defined in the context of mass spectrometry as the charged product of an ion dissociation. A fragment ion may be stable or dissociate further to form other charged fragment ions and neutral species of successively lower mass.
What is the base peak on mass spectrum?
Base peak: The most intense (tallest) peak in a mass spectrum, due to the ion with the greatest relative abundance (relative intensity; height of peak along the spectrum’s y-axis).
What are fragments in mass spectrometry?
In mass spectrometry, fragmentation is the dissociation of energetically unstable molecular ions formed from passing the molecules in the ionization chamber of a mass spectrometer. The fragments of a molecule cause a unique pattern in the mass spectrum.
What is mass spectrometry for dummies?
Mass spectrometry (also called mass spec) provides valuable information about the structure of molecular compounds. Organic chemists can use a mass spectrometer to ionize — or “smash” — a molecular compound in gaseous form, sort the fragments, and then identify the molecule fragments based on their molecular weights.
What is even electron rule?
The even electron rule states that ions with an even number of electrons (cations but not radical ions) tend to form even-electron fragment ions and odd-electron ions (radical ions) form odd-electron ions or even-electron ions.
What is an M 1 peak?
If you had a complete (rather than a simplified) mass spectrum, you will find a small line 1 m/z unit to the right of the main molecular ion peak. This small peak is called the M+1 peak.
What does the base peak tell you?
The vertical axis denotes the relative abundance of ions. The most intensive peak in a spectrum is called the “Base Peak”, whose intensity is taken as 100 percent. This ion exists most abundantly in the ion source and represents the most stable ion, which is useful for identifying the compound.
How are fragmentation patterns formed in the mass spectrum?
FRAGMENTATION PATTERNS IN THE MASS SPECTRA OF ORGANIC COMPOUNDS This page looks at how fragmentation patterns are formed when organic molecules are fed into a mass spectrometer, and how you can get information from the mass spectrum. The origin of fragmentation patterns
What is the product of a fragmentation reaction with C4H9+?
C4H9+would be [CH3CH2CH2CH2]+, and this would be produced by the following fragmentation: The methyl radical produced will simply get lost in the machine. The line at m/z = 43 can be worked out similarly. If you play around with the numbers, you will find that this corresponds to a break producing a 3-carbon ion:
What are the mass spectral fragments of Common hydrocarbons?
Mass spectral fragments of common hydrocarbons Mass Spectral peaks can be identified to have originated from the fragmentation of specific hydrocarbon sources including: Alkanes: 57 / 43. Alkenes: 55 / 41 Per fluorinated hydrocarbons: 69 Aromatics: 75-78, /130-138. Some Common Fragments at m/z include: 14 CH2 15 CH3 16 O 17 OH 18 H2O, NH4
What does the line M/Z = 43 mean on the mass spectrum?
The line at m/z = 43 can be worked out similarly. If you play around with the numbers, you will find that this corresponds to a break producing a 3-carbon ion: The line at m/z = 29 is typical of an ethyl ion, [CH 3CH 2] +: The other lines in the mass spectrum are more difficult to explain.