[Gate-users] Non-reflective surface?

[Jason Maldonis]

Hello all,

I am trying to make a surface that will do, literally, nothing, except
record all the particles that go through it. I have attempted to turn off
all reflectivity but no matter what I do, it still reflects entirely.
When I defined the properties of the surface in the xml file, I have set it
as follows:
 <surface name="test_surface" type="dielectric_metal" sigmaalpha="0.0"
finish="polished">
 <propertiestable>
 <propertyvector name="SPECULARLOBECONSTANT" energyunit="eV">
 <ve energy="4.08" value="0"/>
 <ve energy="1.84" value="0"/>
 </propertyvector>
 <propertyvector name="SPECULARSPIKECONSTANT" energyunit="eV">
 <ve energy="4.08" value="0"/>
 <ve energy="1.84" value="0"/>
 </propertyvector>
 <propertyvector name="BACKSCATTERCONSTANT" energyunit="eV">
 <ve energy="4.08" value="0"/>
 <ve energy="1.84" value="0"/>
 </propertyvector>
 <propertyvector name="REFLECTIVITY" energyunit="eV">
 <ve energy="4.08" value="0"/>
 <ve energy="1.84" value="0"/>
 </propertyvector>
 <propertyvector name="EFFICIENCY" energyunit="eV">
 <ve energy="4.08" value="1"/>
 <ve energy="1.84" value="1"/>
 </propertyvector>
 </propertiestable>
 </surface>

Which I thought would turn off all reflectance. But it doesn't work. Is
there some way to make a surface that does nothing at all?

Thanks in advance,
Jason