Unequal quadrupolar splitting intensities

Hi everyone

I'm running an experiment looking at a mesoporous organosilica soaked in benzene-d6. The pores are tubular and aligned more or less in the same direction, so the anisotropic environment causes quadrupolar splitting when looking at deuterium. However, the splitting intensities are not equal: the left peak tends to be noticeably larger (~10-20%) than the right. Have tried this with the sample at different orientations in the field. At some angles, such at 180 degrees, the peaks are nearly equal in intensity, but at the rest of them the left is higher.

So my question is: what causes unequal intensities in quadrupolar splitting? I know the simplest answer is that there is just another peak that the more intense one sits on, but I'm wondering if there might be any other causes. Can someone point me to some good resources on this? Thanks!

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