Figure 3
MALDI material ejection step as probed by photoacoustic analysis. PA signals were recorded as a function of laser fluence and rectangular flat top spot size from microcrystalline preparations of neat DHB and HCCA matrices (upper graphs). The bottom graphs display the same data set after normalization to the focal spot size, A. The coloured dashed lines depict a best fit of the quasi-thermal desorption model of Eq. (1) to the data, the red dash-dotted lines a best fit of the ln model according to Eq. (2), and the black dotted lines a fit to the linear model of Eq. (3). All data points are mean values of 50 laser shots with a standard deviation of 5–10%.
