
Chapter 5 Optimizing Instrument Settings
5-22 PerSeptive Biosystems
5
Matrix influence
The initial velocity is the average speed at which matrix ions
desorb. The initial velocity of matrix contributes to the higher
order terms in the calibration equation (see Figure 6-1 on
page 6-9). The software allows you to correct the calibration
equation for matrix initial velocity by selecting a matrix in
instrument settings (see page 5-20).
Table 5-5 Matrix Initial Velocity Settings
Matrix
Initial Velocity
(m/sec)
1
,
2
α
-cyano-4-hydroxycinnamic
acid
300
Sinapinic acid 350
DHB 500
3-hydroxypicolinic acid 550
1. Juhasz, P., M. Vestal, and S.A. Martin, “On the Initial Velocity of Ions
Generated by Matrix-Assisted Laser Desorption Ionization and Its
Effect on the Calibration of Delayed Extraction Time-Of-Flight Mass
Spectra”,
J. Am. Soc. Mass. Spectrom.,
1996, 8, 209–217.
2. Juhasz, P., M. Vestal, and S.A. Martin, “Novel Method for the
Measurement of the Initial Velocity of Ions Generated by MALDI”,
presented at the 44th ASMS Conference on Mass Spectrometry and
Allied Topics, May 12–16, 1996, Portland, OR, p.730.
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