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Multiple RV-Spectra

You may perform ramps on an array of sample surface points, defining the array in the Auto Panel (see Figure 4.4n). A ramp is executed and captured, then the tip moves to the next point of the array, each time using the same control parameter values (see Table 4.4h).

  1. In the Auto panel, shown in Figure 1, set the number of RV-spectra in the array using the Columns and Rows parameters—the number of RV-spectra to be performed in the X and Y directions, respectively.

Figure 1: SCM, TUNA, SSRM, C-AFM: Auto panel

Parameter Use with SSRM
Columns, Rows Number of columns (rows) in the array.
Column (Row) step Distance between two subsequent columns (rows).
Threshold step N/A
Capture Select Enabled to save the ramping curves on disk.

Table 1: SCM, TUNA, SSRM, C-AFM: Auto Panel Parameters 

 

  1. Set the spacing between the columns and rows in the array using the Column step and Row step parameters—which define the distance between two neighboring RV-spectra along the X and Y directions, respectively.
  2. Set Mode panel > Trig[ger] threshold and Auto panel > Threshold step to set the trigger voltages for an array of RV-spectra. For automated RV-spectra, increment the trigger threshold voltage in the X-direction:
  1. Set Trig[ger] Threshold to the initial value for the first RV-spectrum in each row.
  2. Increment Trig[ger] threshold according to the value of Threshold step for every subsequent RV-spectrum in each row.

Figure 2: The SSRM Ramp Mode panel

An Example

If a Trig[ger] threshold is 1V and the Threshold step is 0.1V, then subsequent rows of the RV-spectra use a trigger threshold current varying from 1.0, to 1.1, to 1.2,... V. To execute an array of RV-spectra with the same trigger threshold voltage, set Trig[ger] threshold to the desired threshold and set Threshold step to 0.0V.

To execute an array of RV-spectra, click the Auto ramp toolbar button.

To capture the RV-spectra set Auto panel > Capture to Enabled before starting the array. Each spectrum of the array is saved separately. If Capture is set to Off, the spectra are lost.

Export RV-Spectra

To export RV-spectra in ASCII or any other format offered by the NanoScope software, complete the following steps:

  1. Save the current data.
  2. Export the saved data. The export function is located in the File > Export > ASCII menu. Refer to the NanoScope Software User Guide for details.

 

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