Hard X-ray photoacoustic spectroscopy in Cu alloys and compounds

The hard X-ray spectra of Cu alloys (brass and phosphor bronze) and Cu compounds (CuInSe₂, CuO, Cu₂O, CuCl, CuBr, and CuI) have been measured at X-ray absorption near-edge structured (XANES) regions with a photoacoustic detector using synchrotron radiation. It is shown that the information derived from XANES is also included in the X-ray photoacoustic spectrum which reflects the heat production processes in these Cu alloys and compounds. However, the results showed that the increases and changes of the photoacoustic signal were different from those of the X-ray absorption coefficient at the photon energy regions. These differences between the X-ray photoacoustic signal and the X-ray absorption coefficient at the XANES regions suggest the importance of the electron-phonon interaction of these materials