Changing wavelength in dynamic mode
If you are changing wavelength and your Delta lamba is bigger than 0.5 A (eg. you are going from 1.0 A to 1.5 A) , then you must add an additional step: ie stopping at 1.3 A and then moving to 1.5 A. When doing this you have also to optimize the DTB at each step (please refer to "Optimize ion chamber reading for data collection". This is for safety reasons. Ask your beam line scientist for details.
There are two options to change wavelength:
- by using the periodic table(especially if your are working with standard wavelength)
- by using typing in the value for the wavelength you want
- You should be logged on bl10vig1 (how to);
- You should have the GUI (how to) open in front of you;
- After this an interface will appear:
- Click
on EXAFS tab
and then SET UP tab - You will see this:
- Select
the edge of interest by clicking on the actual symbol
- Click
on Move Mono
- Wait
for the cogs
to
stop before doing anything else.
Typing in the value for your wavelength
- You should be logged on bl10vig1 (how to);
- You should have the GUI (how to) open in front of you;
- After this an interface will appear:
- Click
on OEMove tab ,
and then Mono:General tab
- Click on Dynamic:Focussing to select your wavelength, (highlighted in the picture above)
- Make sure that Units is in Angstrom
- Make sure that Mode is in To
- Enter the chosen value in Input Position to select your wavelength
- Click on Start Move
- Wait for the cogs to stop
- Optimise pitch of the second crystal to maximize the flux (Go to Maximize ion chamber readings)
