At 13:25 29.01.99 +0100, Angel Luis wrote:
>Dear all
>
> I am working with a Philips PW-1800 diffractometer and I want to do
>Rietveld's refinament by BGMN code.
>
> I need some variables of it; as goniometer radius, height and width
>of the X-ray tube´s focus, radius and width of the horizontal divergence
>slit, divergence angle of the primary collimator, radius and width of the
>vertical divergence slit, divergence angle of the secondary collimator,
>width and height of the detector slit, radius of a secondary
monochromator....
>
Hi, Angel Luis,
here is a pw1800.sav for calculation the device profile by GEOMET and
MAKEGEQ. Please look at the comments. You must check especially the
detector (receiving) slit used and the tube (focus dimensions). The optical
focus width of standard fine and long fine focus tubes is 0.04mm, a 10th of
the specified thermal focus width, in the case of 6° take off angle. Not
shure about the standard PW1800 tube type.
Best
Reinhard
% Titel of Calculation
TITEL=PW_1800_16mm_Sample
GEOMETRY=REFLEXION
% Name of 'Raytraced' Goniometer Function
VERZERR=pw1800.ger
% Name of Interpolated Goniometer Function
GEQ=pw1800.geq
% Helper Variables
pi=2*acos(0)
% Rowland Circle Radius
R=173
% Estimated 1/mue (mm), should be set to the actual sample value
D=0.1
% Sample thickness (mm)
T=2.5
% Divergence Slit Position (Distance from goniometer axis, here 87 is the
distance from focus to ADS axis)
HSlitR=173-87
% Automatic Divergence Slit opening formula (10 is the const. irradiated
length)
HSlitW=(2*87*10*sin(pi*zweiTheta/360))/(2*173+10*cos(pi*zweiTheta/360))
% Secondary Monochromator Position
MonR=173+59
% Tube Focus Length (mm), please check the type, here long fine focus
FocusH=12
% Optical Focus Width (mm), please check the type, here fine focus
FocusW=0.04
% Detector Slit Heigth (mm), normally the heigth of the graphite crystal
DetH=15
% Detector Slit Width (mm)
DetW=0.1
% Sample Diameter (mm)
SamplD=16
% Primary and Secondary Collimator (Width/Length)
PColl=0.61/20
SColl=0.61/20
% 2Theta List for GEOMET
zweiTheta[1]=6
zweiTheta[2]=10
zweiTheta[3]=16
zweiTheta[4]=24
zweiTheta[5]=34
zweiTheta[6]=48
zweiTheta[7]=60
zweiTheta[8]=90
zweiTheta[9]=120
zweiTheta[10]=150
% Angle Range for MAKEGEQ
WMIN=6
WMAX=150
WSTEP=2*sin(pi*zweiTheta/180)
% Intensity Modelling, necessary for ADS, beam overflow, capillary,
transmission
GSUM=Y
