✍ Scribed by D Edwards Jr
No coin nor oath required. For personal study only.
The shift in the maximum (Tin) of the pressure transient during a thermal desorption experiment from the maximum (To) of the sample desorption rate due to the influence of the vacuum time constant ~ is considered. It is shown that AT/AW, whereAT --Tm -Tp and AW is the full width at half height of the sample desorption rate, is determined by the quantity f3r/AW where is the temperature sweep rate. A general solution of AT/AW as a function of [3flAW is given for 10 -3 < ~/AW < 10 3 for both first and second order desorption transients. In addition an optimization criterion for thermal desorption experiments is described and the implications of this criterion considered. It is found in particular that the simultaneous requirements of negligibly low distortion with maximum measured signal amplitude are satisfied for fJr/dW =0.1 for an elementary first or second order desorption transient.
📜 SIMILAR VOLUMES