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Laser induced thermal desorption of Xe atoms into vacuum from a metal surfacefollowing the nano-second pulsed laser heating was investigated by thetime-of-flight (TOF) measurement. The desorption flow was studied at a widerange of desorption flux by varying the initially prepared Xe coverage {\Theta}(1 ML = 4.5*10^18 atoms/m^2). At {\Theta} = 0.3 ML, the TOF of Xe was wellrepresented by a Maxwell-Boltzmann velocity distribution, which is in goodagreement with thermal desorption followed by collision-free flow. At {\Theta}> 0.3 ML, the peak positions of the TOF spectra were shifted towards thesmaller values and became constant at large {\Theta}, which were well fittedwith a shifted Maxwell-Boltzmann velocity distribution with a temperature T_Dand a stream velocity u. With T_D fixed at 165 K, u was found to increase from80 to 125 m/ s with increasing {\Theta} from 1.2 to 4 ML. At {\Theta} > 4 ML,the value of u become constant at 125 m/ s. The converging feature of u wasfound to be consistent with analytical predictions and simulated results basedon the Knudsen layer formation theory. We found that the Knudsen layerformation in laser desorption is completed at Knudsen number Kn <0.39.

Knudsen layer formation in laser induced thermal desorption