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Spectrum seen for one isomer, but not another - why?

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Morphic flip:
If a compound with 99Ru (or another for that matter) is the central ion, the
99Ru spectrum is seen for one isomer, but not the other isomer, why is this?
I take it`s something to do with shielding and cis/trans isomers?

Dan:
Two things,

1. Which spectroscopic technique are you talking about?
2. Give a specific example.

Morphic flip:
Good point  ::)
It`s NMR
The last part of the question is stating "A 99Ru spectrum is seen for one isomer, but not the other, why/what is the reason.
I`ve got the isomers, obviously (to me) one is cis, one is trans.
It appears like a common (which I don`t know) answer why one isomer would show a spectrum and another not.
Like a general rule or something.

Dan:
Isomers of what compound, it makes a difference?

This is probably due to very fast quadrupolar relaxation in the lower symmetry isomer, but without knowing what the compound is, I can't be sure.

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