Abstract
The effect of the (initial) sample temperature on the threshold laser fluences and the increase of signal intensities with laser fluence has been investigated for UV-laser desorbed 2,5-dihydroxybenzoic acid (DHB) ions and (photoionized) neutral DHB molecules using a ‘flat-top’ laser profile for desorption. A linear increase in threshold fluence with decreasing temperature was observed for neutrally desorbed molecules as well as ions in the investigated temperature range of approximately − 100°C to + 20°C. The results are discussed and interpreted in the framework of a quasi-thermal desorption model (IJMSIP 141 (1995) 127–148).
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