title: Parametric down conversion of X-ray photons.
abstract: Parametric down conversion of X-ray photons in diamond crystals was detected in two experiments, both using the phase-matching scheme first employed in the X-ray regime by Eisenberger & McCall [Phys. Rev. Lett. (1971), 26, 684-688]. The conversion events were detected by a combination of time-correlation spectroscopy and energy discrimination, using Si drift-chamber detectors. The time-correlation spectra give a direct comparison of the conversion rate over the accidental coincidence rate. Mechanisms for possible detection of false events and ways to cross check against them are discussed in detail.
authors.affiliation: Hamburger Synchrotronstrahlungslabor HASYLAB am Deutschen Elektronen-Synchrotron DESY, Notkestrasse 85, 22603 Hamburg, Germany. adams@x4u2.desy.de
authors.forename: B
authors.initials: B
authors.lastname: Adams
authors.forename: P
authors.initials: P
authors.lastname: Fernandez
authors.forename: W K
authors.initials: WK
authors.lastname: Lee
authors.forename: G
authors.initials: G
authors.lastname: Materlik
authors.forename: D M
authors.initials: DM
authors.lastname: Mills
authors.forename: D V
authors.initials: DV
authors.lastname: Novikov