Tecnai on-line help manual -- Options - UT Southwestern

<strong>Tecnai</strong> on-line help Options 75Options Software version 25.6.3 Tilt menuThe Tilt Menu contains the items that control the tilting operations. During tilting operations the softwarekeeps track of (a limited amount of) past stage positions (approximately 50) so a tilting operation canalways be undone. Once one or more operations is undone, it is also possible to step through themforward again.Show reminderZone axisBraggSet stepLeftRightSwitchUndoRedoDisplay listCopy (as text)CompucentricThe tilting operations rely on a measurement of the diffraction shift. Startingposition must therefore always be a well-centered diffraction pattern. If thereminder is on, the operator will be reminded before each diffraction-shiftmeasurement to check the centering of the diffraction pattern.Starts the Full (zone-axis) tilt procedure.Starts the Bragg tilt procedure.Sets the tilt step used for Left and Right tilting. The tilt step is the absolutechange in angle in space (so made up of the proper combination of alpha andbeta tilt).Tilts around the systematic row (defined by the Bragg tilt or Switch directionoperation) to the left.Tilts around the systematic row (defined by the Bragg tilt or Switch directionoperation) to the right.Changes the direction of the systematic row. This procedure is similar inoperation to the Bragg tilt except that only the measurement is executed andno change of tilt is made.Switches back to previous stage position.Goes forward to next stored stage position.Display the list of past tilting operations. Any of the items can be selected byclicking. A right-hand mouse-button click will popup a menu with Hide list(equivalent to using Display list in main menu again), Go to selectedposition, Copy (as text).Copies contents of tilt list as text to the clipboard. It can then be pasted intoany program that accepts text input.Enables (checked) or disables compucentric tilting. Function is disabled whenTEM Compucentricity is absent.5.6.4 Focus menuThe Focus Menu contains a number of functions that are related to the use of the focus functionality forrapid toggling between focussed diffraction pattern and shadow image. The Focus and Defocus settingsmust be defined before these functions can be used. It is advised to define these on a regular basis (e.g.each microscope session).FocusDefocusCBEDSAEDDefine focusDefine defocusToggles to focus condition.Toggles to defocus (shadow image) condition.Select CBED focus/defocus (Intensity is focussing lens).Select SAED focus/defocus (Diffraction lens used for focussing).Defines focus condition (use Intensity for CBED, Diffraction focus for SAED).Defines defocus condition (use Intensity for CBED, Diffraction focus forSAED).