Raw time-of-flight signals acquired for Al, Fe, Zn, and Sn as a function of collection angle. The time scale is triggered by the occurrence of the photopeak, shown at .
Experimental velocity distribution functions for Al, Fe, Zn, and Sn ions for three different collection angles. The peak of the on-axis distribution relates to the bulk flow drift velocity, whereas the spread provides information on the LIP temperature. The curve characteristics are summarized in Table I.
Experimental angular distribution of the TOF integrated intensities for Al, Fe, Zn, Sn, and simulated profiles obtained with a Lorentz distribution. The following angular distribution values were determined: Al, ; Fe, ; Zn ; and Sn .
Curve metrics of the velocity distributions shown in Fig. 2, together with calculated temperatures in eV. It should be reminded that for . The degrees in the parentheses refer to the collection angle. The integrals give the total number density of ions ablated, the peak height is the maximum density, the peak position is the plasma mode velocity that on axis is the center-of-mass drift velocity, and the spread is proportional to the temperature as in Eq. (2). The LIP temperature is calculated from the on-axis spread value. N/A is “not available,” because the profile was not well above background level.
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