A time-resolved ultrafast x-ray spectrometer is developed in order to extract the x-ray absorption near-edge spectroscopy (XANES) structure of an Al sample in thewarm dense matter regime. In this context, an intense, broadband, short (ps) x-ray source based on the M-band emission from high-Z plasmas is optimized to maximize the photon flux around the Al K-edge. An experiment is reported, devoted to probe a solid Al foil isochorically heated by laser-produced protons up to 3 eV. The experimental x-ray spectra lead to an estimation of the electron temperature with an accuracy of 15%. In good agreement with two different theoretical approaches, the observed progressive smoothing of the XANES structures is clearly related to a significant loss of ion–ion correlation.
X-ray absorption for the study of warm dense matter / A., L., F., D., M., H., C., F., S., H., O., P., J. J., S., Antici, P., P., A., J., F., Lancia, L., A., M., M., N., S., M., V., R., P., R., S., F.. - In: PLASMA PHYSICS AND CONTROLLED FUSION. - ISSN 0741-3335. - 51:12(2009), p. 124021. [10.1088/0741-3335/51/12/124021]
X-ray absorption for the study of warm dense matter
ANTICI, PATRIZIO;LANCIA, LIVIA;
2009
Abstract
A time-resolved ultrafast x-ray spectrometer is developed in order to extract the x-ray absorption near-edge spectroscopy (XANES) structure of an Al sample in thewarm dense matter regime. In this context, an intense, broadband, short (ps) x-ray source based on the M-band emission from high-Z plasmas is optimized to maximize the photon flux around the Al K-edge. An experiment is reported, devoted to probe a solid Al foil isochorically heated by laser-produced protons up to 3 eV. The experimental x-ray spectra lead to an estimation of the electron temperature with an accuracy of 15%. In good agreement with two different theoretical approaches, the observed progressive smoothing of the XANES structures is clearly related to a significant loss of ion–ion correlation.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
