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None Molecular hydrogen in GDML 

Forum: Geometry
Date: 02 Oct, 2013
From: Elias Roussos <Elias Roussos>

Hi,

I am trying to define a series of layers of an atmosphere containing atomic and molecular hydrogen (H, H2). I am using GDML for my geometry.

I had a look to some GDML examples to get familiar with the syntax e.g.:

http://gdml1.web.cern.ch/gdml1/doc/g4gdml_howto.html

I tested parts of this example in my code, and it worked well. E.g. there were no problems with the definitions of elements, or materials like the "Air"

But trying to add H2, I got all kinds of error messages (e.g. that Z=0, density is undefined etc.)

I used this syntax:

  <material name="H2" formula="H2">
   <D value="1.0"/>
   <composite n="2" ref="Hydrogen"/>
  </material>

modifying from the link above the entry:

 <material name="Water" formula="H20">
   <D value="1.0"/>
   <composite n="2" ref="Hydrogen"/>
   <composite n="1" ref="Oxygen"/>
 </material>

Any idea why definition of H2 fails?

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