Size-selective extended X-ray absorption fine structure spectroscopy of free selenium clusters

Nagaya, Kiyonobu*; Yao, Makoto*; Hayakawa, Tetsuichiro*; Omasa, Yoshinori*; Kajihara, Yukio*; Ishii, Masashi*; Katayama, Yoshinori

Recently, we proposed a new method for the size-selective EXAFS(Extended X-ray absorption fine structure) of neutral-free culsters, in which not only the X-ray absorption process but also the deexitation process are utilized as the structural information. In order to verify this method experimentally, we have developed the synchronous measurements of EXAFS and photoelectron photoion coincidence and carried them out for a Se cluster beam by utilizing the third-generation intense X-ray source. The EXAFS spectra for Se small clusters have been obtained and compared critically with theoretical predictions.