Abstract
The SERS 'polarisation flip' method, which can be used to measure the intensity ratio of otherwise inaccessible infrared atomic transitions, is found to suffer from certain intrinsic limitations and sources of error. In particular the intensity ratio for the 7s2S1/2-7p2P1/2,3/2 transitions of atomic caesium, as measured previously using this technique, could be in error by as much as a factor of 2.

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