Zoom scan mode

FIGURE 15.3 (a) Data were acquired with a modified 4000 MS. At a scan speed of 20,000 Th s , the isotopic peak of the ion of m/z 614 is almost baseline separated, (b) Data were acquired with a Varian 500 LC/MS in order to show the mass resolution of the doubly-charged ions (separated by 0.5 Th) in a triple-resonance instrument. The mass spectrum shows clearly that the isotopic peaks of the doubly-charged ions are almost baseline separated at a scan speed of 5000 Th s". Note that this excellent mass resolution is achieved with the normal scan speed of 5000 Th s", not in zoom scan mode. 

The analyze mode display is similar to the scan mode display used online. Analyze mode includes functions for evaluation of data, e. g. markers, measure functions, zoom function and selection of cross-section views. In addition, A-scan data can be reconstructed into images and displayed. 

Fig. 10.14 Ultraflat, homogeneous BCB sample measured in tip-scan mode the same sample spot remains in the laser focus while the tip is scanned [see schematic in inset of (d)]. (a) Reflectivity image, The fringes are due to an optical interference between cantilever and sample surface. The cantilever is not parallel to the sample surface, (b) Zoomed reflectivity image of tip region. Raman spectra were measured along...

Hence it can be concluded that CM-AFM is in many cases a poor choice for imaging the surface morphology of amorphous polymers. Intermittent contact modes, such as tapping mode, are less invasive, since here lateral forces are virtually eliminated and the cantilever-tip assembly is oscillated at relatively high frequencies (on the order of 100 kHz in air). Despite these facts, it must be ensured in any experiment that the interaction of the scanned probe and the surface did not lead to a modification of the surface. This can be conveniently done by imaging both a previously scanned and previously unscanned area by zooming out. 

The scan rate in the Scan-Syne-In mode is determined essentially by the sean-ner. Therefore, the scan rate, zoom, or region of interest seleeted in a seanning microscope automatically acts on the TCSPC reeording. Seanning ean simply be started und continued until a suffieient number of photons has been eolleeted. 

Top pamh Some representative surface morphologies of pentacene scanned by tapping mode AFM. (a) 20 A pentacene—three monolayers can be seen—and 5 x 5 im field of view, (b) 50 A pentacene—five monolayers can be seen—and 5 x 5 im field of view, (c) Area zoomed in (b). Bottom panel. Computer simulation results where one can identify (a) three monolayers and (b) five monolayers, (c) Area zoomed in (b). The size of the lattice is 200 x 200 and the total number of particles deposited in (c) is about 90,000. (From Zorba, S. et al., Phys. Rev. B, 74, 245410, 2006. With permission.)... 

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