Iam not sure these signals true or not. These signals seems to be noise. I was also find these type of signals with sample or without sample also. Since absolute intensity very less ,signals also very week. In MALDI-MS signal intensity 3 times higher than noise. I think you can try with ferulic acid as a matrix. It can work for high molecular weight compound. Further more polymer spectrum never look like these. We will get signals like tree with continuous. See the attachment paper may help you.
thank you sir.. i dont want to know the fragmentation pattern in this graph. can i simply find the molecular weight of the polymer from the low intensity signal present in the graph. Nearly 80000 a small peak is present. can i take it as molecular weight
These type of peaks(low intensity ) we can also see with simple MALDI-MS plate and with matrix also. which your saying small peak , these peak intensity more or less 10 it is generally consider as a noise. Moreover polymer peak generally we don't get sharp or single peak. So i can't suggest these results.
However if you want conform it .
1.Compare spectra a)MALDI Plate alone ,b)MALDI Plate +Matrix, c) MALDI Plate+ Matrix+polymer. If u get the signal only in case of (c)
Next check with different concentration of you polymer. Here if you find the increasing signal intensity with concentration. Then i think its ok . Additionally you can also perform the calibration .