## About Kikuchi Lines

### * What is this?

This program calculates Kikuchi Lines in RHEED (Reflection High-Energy
Electron Diffraction) condition.

This program works with:
CPU: 68020 or higher, PowerPC series
Operating System: Mac OS 7.5 or higher with Thread Manager

This program is a "Fat Binary". It was created using Metrowerks
CodeWarrior Pro with PowerPlant on Power Macintosh 9500/200 and
7600/200 (both Mac OS 8J). It was tested only on 9500/200 (Mac OS 8J),
7600/200 (Mac OS 8J), and 7100/120 (Mac OS 7.5.3J). It may be run on
System 7.1, try at your own risk.

### * General caution

This program is a freeware but not public domain. Hitoshi Nakahara
holds the copyrights. You can not duplicate and/or distribute and/or
modify the software and associated documents without written
permission.

The author makes no warranties. Use the software at your own risk. The
author claims no liability for data loss or any other problems caused
directly or indirectly by the software.

You need enough knowledge for RHEED and its related physics to use the
software. There is no explanation about these physics.

The source codes of this program are also available from the WWW page
of Ichimiya Lab. You can use and/or modify them within private use.
However, you can not distribute modified software and/or source codes
without written permission of copyright holder. You need Metrowerks
CodeWarrior Pro for Macintosh and PowerPlant to use the source codes.
No question about the codes is acceptable.

### * How to use

When you launch the application, parameter setting dialog will be
shown. Enter appropriate values and hit to calculate Kikuchi Lines.
The following is the brief explanation of the parameters.

Crystal Structure

 * Structure: Chose crystal structure. This version supports 4
   structures, Simple Cubic, Face Centered Cubic, Body Centered
   Cubic, and Diamond Structure.
 * Lattice Constant: Enter lattice constant. The default value is
   that for Silicon.
Inner Potential: Enter effective inner potential near the surface. The
potential affects refractive effect for outgoing electron. The default
value is that for Silicon.

Surface

 * Index: Enter surface index. Integer from -99 to 99 is available.

Incident Electron

 * Azimuth: Enter azimuth index of incident electron. Integer from
   -99 to 99 is available.
 * Azimuth Off Angle: Enter off azimuth angle from the above azimuth
   index.
 * Glancing Angle: Enter glancing angle of incident electron.
 * Electron Energy: Enter incident electron energy in KeV.

Drawing

 * Camera Length: Enter camera length in mm.
 * Index Range: Enter calculation range from 1 to 99.
 * h+k+l >: Enter limit of sum of index numbers. If you set 4 for
   Index Range and 10 for the Limit, (443), (444) etc. will be
   ignored. Integer from 3 to 100 is available.
 * Resolution: Enter calculation unit of angle. This corresponds to
   angle resolution around the Kossel Cone. You'd better increase the
   application memory when you decrease this value.
 * Ignore Kinematical Extinction Law: Check this to ignore
   kinematical extinction, which means that diamond structure is the
   same as fcc.
 * Suppress Defect Lines: Check this to hide defect Kikuchi lines.
   However, calculation itself is the same and TEXT save always
   includes defect lines.
 * Mark Specular Spot Position: Check this to mark specular spot
   position.
 * Show Line Indexes: Check this to show line indexes.
 * Show Parameters: Check this to show parameters in the result
   window.

Buttons

 * Revert to Default: Revert all settings to the default ones.
 * Save as Default: Save current settings as the default.
 * Cancel: Do not calculate.
 * Draw...: Start calculation.

Click to start calculation. Click to cancel calculation. Calculations
can be in background. You can change parameters by clicking on button
or choose "Parameters" in the Simulation menu.

The results can be saved in a Kikuchi Lines document. In addition, you
can export results in PICT or TEXT format via "Export" in the File
menu. You can also drag&drop the results into the other graphics
applications (such as GraphicsConverter) or Finder to export PICT
data.

The TEXT file exported consists of three parts, parameters (first 3
lines), line data (n lines), and specular data (last line). Each line
data line consists of 4 parts, line marker (*** is new line, ... is
re-appeared line), normalized crystal structure factor (negative means
a defect line), line index (h, k, l), and points data(x1, y2, x2,
y2...). The point data is in mm unit and the origin is the center
position between direct spot and specular spot.

### * Options

The following is brief explanation of options, which can be shown via
"Options" in the File menu.

Draw Options

 * Canvas Size: Enter size of result window in pixcels. Width should
   be in the range between 400 to 2000, height between 100 to 2000.
 * With Colors: Uncheck this to draw in B/W. However, saved PICT data
   is always in colors.
 * Colors: Click colored pane to choose corresponding colors.

Save Options

 * Save PICT as: Enter creator code of PICT files. The left shows the
   document icon. You can choose an application or a document by
   clicking on the button. You can also Drag&Drop an application or a
   document icon onto this field from Finder.
 * Save TEXT as: Enter creator code of TEXT files as same as the
   above.
 * Delimiter: Choose delimiter code of items for TEXT data.
 * Newline: Choose newline code for TEXT data.

Buttons

 * Factory Setting: Revert all settings to the factory ones.
 * Cancel: Cancel modification.
 * OK: Save settings and close the dialog.

All options only affects windows opened after the option setting.

Author: [[email protected]][1] [Hitoshi Nakahara]
Dept. Quantum Eng./Dept. Appl. Phys., Nagoya Univ.

Compatibility
Architecture: 68k

  [1]: mailto:[email protected]