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The ion desorption by C 1s electron excitation was studied for thin films of selectively deuterated polystyrene using the ion time-of-flight method with monochromatic synchrotron radiation pulses. By comparing the photon energy dependence of partial ion yields of deuterium ion of polymers, it was found that the observed deuterium ion originates mainly from the pendant phenyl group. Further, we found that the partial ion yield spectra of deuterium ion are useful in discussing the origin of the absorption features by comparing with those measured with the total ion yield method.