PHOTON-STIMULATED D-SHELL EXCITATION( DESORPTION FROM SELECTIVELY DEUTERATED POLYSTYRENE BY INNER)

The ion desorption by carbon Is electron excitation was studied for th in films of selectively deuterated polystyrene ([-CD2-CD(C6H5)-](n), [ -CH2-CH(C6D5)-](n), and [-CD2-CD(C6D5)-](n)) using the ion time-of-fli ght method with monochromatic synchrotron radiation pulses. By compari ng the photon energy dependence of partial ion yields (PIY's) of D+ of these polymers, it was found that the observed D+ originates mainly f rom the pendant phenyl group. Further we found that PIY spectra of Dare useful in discussing the origin of the absorption features by comp aring with the total electron yield.