Nanosurf easyScan 2 AFM, Operating Instructions Manual

Page: 128 / 164

S
PECTROSCOPY
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Spectroscopy
In a spectroscopic measurement, the input channels are measured as a func-
tion of a modulated parameter. This modulated parameter can be the Z-
distance to the sample, the tip voltage, or a User output channel (when the
Signal Module: A is installed). Note that you must electrically connect the
sample to the ground connector on the easyScan 2 AFM AFM scan head to
apply a tip-sample voltage difference. The measured parameter can be any
available input channel. Examples of a spectroscopic measurements are
force/distance curves in the AFM static force mode, amplitude/voltage
curves in the AFM dynamic mode, or current/voltage curves with the STM.
The accuracy of the spectroscopic measurements can be increased by aver-
aging the measurement results of several consecutive modulations. A spec-
troscopic measurement sequence consists of a number of spectroscopic
measurements of the same type, measured along a user defined line in the
XY-plane. A point measurement is made if the number of points is one. The
measurement sequence is carried out as follows:
1. The tip is moved with active Z-control to the start of the line.
2. The Z-Controller is switched off.
Spectroscopy window