The spectrometric properties of several hydrophthalate crystals (KAP,
RbAP, TlAP and CsAP) are studied by using the synchrotron radiation. W
e especially investigate cesium hydrophthalate for which little inform
ation is available in the literature. We present experimental measurem
ents of rocking curves at 1000 eV and 2500 eV performed on the SB3 bea
mline of Super ACO storage ring (LURE-Orsay).