A tandem version of it is commonly used to sequence proteins, and the aforementioned techniques are used to ionize the sample before it is fragmented.
A method of preparing samples for this technique without significantly altering their environment is DART. Samples are usually prepared either via adding a sample to a crystal and then firing a laser at it, or by dispersion in aerosol form and subsequent evaporation. Most analyzers in this technique can rely on a quadrupole ion trap or use a reflectron to measure the time of flight. A tandem version of it is commonly used to sequence proteins, and the aforementioned techniques are used to ionize the sample before it is fragmented. It is often preceded by gas or liquid chromatography. For 10 points, name this technique in which a sample is separated into pieces and analyzed via their mass to charge ratio. 
A method of preparing samples for this technique without significantly altering their environment is DART.
 mass spectrometry [or mass spectroscopy; or MS]