By clicking 
in
the tool menu bar at the left corner of screen, the background of displayed
spectrum can be subtracted by active Shirley method. The data processing
panel appears at the right side of the figure. The subtraction conditions
are displayed in the panel.
Note: Active Shirley background subtraction is only applied to X-ray Photoelectron Spectroscopy.
Determine background subtraction range
A part of the displayed range
Enclose the background subtraction range by a mouse. The rectangle which indicates the background subtraction range can be modified by dragging the sides of rectangle. After the range is determined, background subtraction starts. If blue [X] button is clicked, the range setting is cancelled.
The whole range of the displayed spectrum
If [whole range] check box is checked, the displayed range of a spectrum can be subtracted. After the range is determined, background subtraction starts. If [whole range] check box is unchecked, the whole range setting is cancelled.
Determine background subtraction conditions
Background subtraction by active Shirley needs peak positions in a spectrum. A peak is identified if its height exceeds the level indicated in [detection level] text box (100% - [detection level]) * maximum height of spectrum). If the differentiated peak height exceeds <(100% - [detection level]) x [ maximum height of differentiated peak in the target range]>, that peak is identified as a peak. The detection level can be changed by the VScrollBar. The fitting function used for active Shirley is pseudo Voigt function. The ratio of Lorentz function can be changed by the selection buttons. If [fixed to] button is selected, the ratio of Lorentz function is fixed to the value indicated in the text box. The value can be changed by the VScrollBar. If [variable between] button is selected, the ratio of Lorentz function is automatically adjusted between the values indicated in the text boxes. The values can be changed by VScrollBars.
Display background subtraction results
The background line is displayed. The background subtracted area intensity is shown in the table. The fitting residue is shown by clicking [residue] tab, and pseudo Voigt functions and synthesized curve are shown by clicking [fitting] tab. If the inside of the enclosure is clicked by the right button of a mouse, the enclosure is erased. When [zoom] button is clicked, enclosed area is zoomed. When [subtract] button is clicked, background subtracted spectrum is displayed. If blue [X] button is clicked, the original spectrum will be back.
Display fitting results
When [fitting] tab is clicked, pseudo Voigt functions and synthesized curve are overlaid on the spectrum.
Select other background subtraction regions
When backgrounds of plural regions of a spectrum are subtracted, the background subtraction ranges are displayed in the list box. If one of items of the list box is clicked, the background subtraction result of the clicked region is displayed.
Select other blocks
Select block number in the combo box [block number], then the spectrum of the selected block number is displayed. Enclose subtraction range or check [whole range] check box. Then the selected region is background subtracted.
Modify display style
Select [line design] tab. Then display style of figure can be modified. Click [color] button, then color pallet appears. Select any color from the pallet, then line color is changed to the selected one. If the [range bar (rpl. encl)] check box is checked, the enclosure is changed to left and right bars.
Save background subtraction results
The background subtraction data can be saved as a csv file by clicking [save] button. The saving items are subtraction range, the background subtracted area intensity, background line and background subtracted spectrum.
Show the results of fitting
By selecting the [fitting] tab page, the list of pseudo Voigt functions is displayed.
Compare the active Shirley results with the iterative Shirley
By selecting [background by iterative Shirley] tab page, background lines both by active and iterative Shirley are shown. Subtraction region can be selected by clicking one of items in the list box.
