BGMN FAQ
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Frequently Asked Questions
  1. Win 95/NT: Why does BGMN not run?

    Probably, you have started BGMN (or another of the eight EXE's) by double clicking in the Windows file manager. This doesn't work! The BGMN EXE's all together are designed to run in a command line screen. At first, you must open such a screen for Win32 programs. (Win95: MS-DOS Prompt, WinNT: Command Prompt). UNIX users are familiar with such command line programs. BGMN and most of the other BGMN EXE's are called in an unified manner: 

    BGMN    name-of-the-sav-file [ other-parameters ... ]
GEOMET  name-of-the-sav-file [ other-parameters ... ]
MAKEGEQ name-of-the-sav-file [ other-parameters ... ]
OUTPUT  name-of-the-sav-file [ other-parameters ... ]
SHOW    name-of-the-sav-file [ other-parameters ... ] 
SHOWGER name-of-the-sav-file [ other-parameters ... ]
    There is no other input to the command line while the programs are running. The EXE's are designed for automatic batch mode.

  2. Is it possible to use BGMN without a calculated instrumental function?

    Yes. For instance to refine synchrotron data. Then the global parameters k3 and EPS4 should be introduced into the control file: 

    PARAM=k3=0_0
PARAM=EPS4=0
    For the instrumental function a formula has to be provided: 
    VERZERR=S/(2*R*sqrt(12))
    S is the width of the receiving slit and R is the measuring circle radius of the goniometer.

    Please note, that in this case no asymmetries due to instrument abberations can be taken into account.

  3. Why the calculated lattice constants are not correct?

    Please check the values of the zero point and the displacement parameter. Often a to large zero point parameter with a corresponding large displacement parameter is calculated. As a result the lattice constants are faulty.

    In this case the zero point should be refined with a narrow variation range: 

    PARAM=EPS1=0_-0.0001^0.0001
  4. Where is the background?

    BGMN automatically determines the necessary order of a polynomial background and fits it. In the graphical output is is shown as a separate green line (command 'show').

    Manual predetermination of background is not recommended.

  5. Where the commercial version of BGMN is available?

    You can purchase the full version at your local representative of SEIFERT. They also sell AUTOQUANT, a graphical user interface (GUI) specialized to the common task of quantitative analysis.