base peak


Also found in: Medical.

base peak

[′bās ‚pēk]
(spectroscopy)
The tallest peak in a mass spectrum; it is assigned a relative intensity value of 100, and lesser peaks are reported as a percentage of it.
References in periodicals archive ?
It was noteworthy that the proportion of variant base peak was similar to that of differential site on exon 7 [Figure 6] and [Supplementary Figure 2 [SUPPORTING:2]].
The spectra of all the formulated compounds showed molecular ion peak as the base peak as well as it was the most stable fragment produced.
The molecular ion peak is denoted by value in bold while the italic value refers to the base peak. Mass spectra of all compounds from 3a-8a gives base peak at 232 m/z that was originated by the cleavage of phenyl ring from the original molecule and matched the testified standard value.
For the strongest peak in each mass spectrum (the "base peak"), the 95% uncertainty intervals are probably also reliable, but for other peaks, the 95% intervals may be too narrow [4].
As: 1 Collector Emitter Voltage-700V 2 Collector Emitter Voltage-400V 3 Emitter Base Voltage- 9V 4 Collector Current- 4A 5 Collector Peak Current - 8A 6 Base Current-2A 7 Base Peak Current- 4A 8 Total Dissipaton @Tc Equal To 25 Degree C 75W 9 Storage Temp: Minus 65 To 15 Degree C 10 Max.Operating Junction Temp- 150 Degree C .
It is observed that the molecular ion of ethanol (mass 46) is in fact not the most significant peak and typically mass 31 (the CH20[H.sup.+] fragment ion) is selected as the base peak for ethanol calibration.
MRIC of each cellulosic materials characterized by area at different retention time and each area has a fixed base peak (100%) in mass spectra that is characterized to monomer cellulose and cellulose xanthate.
A 6-C-pentosyl-8-C-hexosyl substitution was indicated for compound 3, due to the increased abundance of the fragment ion at m/z 489 (base peak), in relation to the fragment ion at m/z 459, according to Lin and Harnly (2010).
The observation of the base peak of nerolidol resulting from the loss of water is consistent with other reports.
The mass spectrum showed a peak at m/z 254 (M + [H.sub.2]O, 5%) with a base peak at 103.