BACKscattering cross section

[GoogleCodeExporter]

What steps will reproduce the problem?
1.I'm interested to calculate the BACKscattering cross section of particles of 
various shape and dimension
2.
3.

What is the expected output? What do you see instead?
I presume that I should have the same value for backscattering cross section 
both along Y and along X, both for symmetric particles and for asymmetric ones, 
both for particle rotated over Z and for not rotated over Z. But I read for 
"Csca" different values. I tried to modify also the "alldir_param.dat" file 
setting "min" and "max" for theta and phi egual to 180 but I don't found 
changes. Can you help me? Thanks a lot.

What version of the product are you using? On what operating system?
The version is the last and the result is the same on both Windiws and Linux OS.

Please provide any additional information below.

Original issue reported on code.google.com by leo_pi...@libero.it on 20 Mar 2012 at 3:31

[GoogleCodeExporter]

The most straightforward way to calculate backscattering cross section is 
through the values of the Mueller matrix at theta=180 degrees. See, e.g. 
Section 2.1 of http://dx.doi.org/10.1016/j.jqsrt.2009.02.020 . I am going to 
add similar description to the next version of the manual, but it is not ready 
yet.

Concerning the expected output that you describe, it is not easy to judge if it 
is "expected" or not. It seems to me that backscattering cross section should 
generally depend on the incident polarization (or equivalently particle 
orientation). And limiting the integration of Csca to a single value is kind of 
weird (although it might work).

So if you're sure that ADDA produces unexpected output, specify the test run in 
details as a comment to this issue. Otherwise, please send how-to questions to 
the discussion group - adda-discuss@googlegroups.com .

Original comment by yurkin on 21 Mar 2012 at 10:03

• Changed state: Invalid