Introduction

This page is an interface to the Bragg planes search tool which is complimentary to the X0h program calculating crystal susceptibilities X₀ , X_h (chi-zero , chi-h) in x-ray wavelenth range. For better understanding of this tool please read first the description of X0h.

The X0h-search is a part of my program called X0h+ (or X0p). Currently existing as a MS DOS program only, X0p provides several tools for planning x-ray experiments like calculating crystal stereo projection diagrams with graphical presentation of relative X_h values, searching for the Bragg reflections under various conditions, and simulating Laue patterns of crystals with different surface orientations.

The online version of X0h-search is available since June'2001. The parameters defining the search are:

1. Miller indices range,
2. Bragg angles range,
3. Minimum intensity of Bragg reflection defined as |xh|/|x0|,
4. Range of angles with respect to given plane (e.g. surface).

The following 3 options are provided to search for the Bragg planes making certain angles with given crystallographic plane:

1. Vary the Bragg planes indices, compute the angle Q with the surface, then verify the condition:
   Q1 < Q < Q2
   where Q1 and Q2 are the parameters defining the search range.
    
2. Vary the Bragg planes indices, compute their Bragg angle QB and the angle Q with the surface, then verify the condition:
   Q1 < Q < QB - Q2
   If Q1=Q2=0, this mode gives all the possible Bragg-case reflections.
    
3. Vary the Bragg planes indices, compute their Bragg angle QB and the angle Q with the surface, then verify the condition:
   QB - Q1 < Q < QB - Q2
   If the values of Q1 and Q2 are small, this option is very effective to search for extremely asymmetric reflections.

Other possible applications of the search tool are:

• Find all the planes with the Bragg angles from QB1 to QB2,
• Find all strong reflections,
• Find any planes in crystal which make angles from Q1 to Q2 with given plane...

Click here to proceed to X0h-search input form.

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	Site navigation: Home page X-ray scattering factors (X0h) Search for X-ray Bragg planes (X0h-search) X-ray Bragg diffraction (GID_sl) X-ray specular reflection (TER_sl) X-ray scattering from roughness (TRDS_sl) X-ray resonant reflection (MAG_sl) X-ray Multiple Bragg diffraction (BRL)