Spectrometric Properties of Crystals for X-Ray Astronomy.

Burek, A. J.; Barrus, D. M.; Blake, R. L.

doi:10.1086/152993

Cited by 36 publications

(11 citation statements)

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“…The obtained results are in agreement with the data presented in [1,3,4]. This investigation was devoted to the determination of the ratio of the second to fi rst order refl ection.…”

Section: Discussionsupporting

confidence: 89%

“…It turned out that the accuracy of the obtained result is quite satisfactory and it is much better than for the results reported in e.g. [1]. By applying the pulse height analysis one can improve the accuracy by selecting only the pulses associated with the line under study.…”

Section: Discussionmentioning

confidence: 63%

“…For soft X-ray spectroscopy the organic crystals -such as acid phtalate (KAP, TlAP) or lead stearate (PbSt) -are commonly used [1,2].…”

Section: Introductionmentioning

confidence: 99%

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Second order reflection from crystals used in soft X-ray spectroscopy

Książek

2015

Nukleonika

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Abstract. In this note the ratio of the second to the fi rst order refl ection is determined for the KAP and PbSt crystals, for wavelengths corresponding to the Al K-line emission. The source of the radiation was a low-voltage stabilized X-ray tube. The X-rays were detected with a Bragg spectrometer equipped with a proportional counter detector. The signal measured by the proportional counter was subsequently pulse height analyzed.

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“…The obtained results are in agreement with the data presented in [1,3,4]. This investigation was devoted to the determination of the ratio of the second to fi rst order refl ection.…”

Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 63%

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Second order reflection from crystals used in soft X-ray spectroscopy

Książek

2015

Nukleonika

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“…PET is a crystal often used in diffraction studies over the 1-7 A, range but deteriorates with age or strong X-ray irradiation, is soft and readily deformed and should be stored in a desiccator (Burek, Barrus & Blake, 1974;Burek, 1976). It deforms plastically under stress, but has the advantage of a high integrated reflectivity.…”

Section: Application To Pet 002mentioning

confidence: 99%

X-ray diffraction of bent crystals in Bragg geometry. I. Perfect-crystal modelling

Chantler¹

1992

J Appl Cryst

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X-ray reflectivity, widths, centroid shifts and profiles for curved perfect crystals are calculated from a model. The crystal is approximated by a stack of perfectcrystal lamellae or blocks with a gradually changing (mean) orientation. A computer program has been developed to calculate the above quantities in the Johann geometry for the composite crystal from the dynamic theory of diffraction. Focusing and defocusing aberrations and the use of photographic detection methods are included. Correction of omissions from earlier theory and modelling is noted, together with observed effects. Incoherent scattering can give dramatic changes in diffracted intensities and significant shifts of final parameters. Effects of depth penetration on shifts, cosine ratios and other parameters are included. Assumptions of the model and implementation are detailed. It is shown that interference effects between waves of roughly equal amplitudes require use of lamellar thicknesses greater than those corresponding to the Darwin range. Internal tests demonstrate agreement with the literature at extremes. The theory is applied to first-and fourth-order spectra in differential Lyman ~ wavelength measurements. Resuits for pentaerythritol 002 crystals are presented. Paper II of this series extends this model to nonideally imperfect crystals and other crystals of interest and discusses experimental agreement.

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“…For the transmission of the 2 gm polycarbonate window experimental data obtained at the BESSY synchrotron radiation laboratory were used [17]. Corrections for the wavelength dependence of the KAP crystal reflectivity were made, using available experimental [18] and theoretical [19] data. The dependence of the crystal reflectivity on the polarization of the X-ray photons is found to be of minor importance for the calibration and main experiment measurements, since polarization degrees of only 2% were found in polarization and X-ray Zeeman quantum beats measurements [20].…”

Section: Efficiency Calibrationmentioning

confidence: 99%

Radiative and autoionization rates of the metastable 24 P 0 J states in lithiumlike neon

Charalambidis

Koulen

Brenn

1989

Z Phys D - Atoms, Molecules and Clusters

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Atoms.Molecules zo,,0o.r,, and ClustersThe delayed X-ray and electron emission from metastabte states in fast, foil excited neon ions has been investigated. High resolution X-ray and electron spectroscopy at calibrated relative detection efficiencies was applied to determine fluorescence yields for the radiative decay of the (ls2s2p)4Ps °, J = 1/2, 3/2, 5/2 states in NeVIII. Using measured total lifetimes corrected for cascading effects the forbidden radiative and autoionization rates were determined.

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Spectrometric Properties of Crystals for X-Ray Astronomy.

Cited by 36 publications

References 0 publications

Second order reflection from crystals used in soft X-ray spectroscopy

Second order reflection from crystals used in soft X-ray spectroscopy

X-ray diffraction of bent crystals in Bragg geometry. I. Perfect-crystal modelling

Radiative and autoionization rates of the metastable 24 P 0 J states in lithiumlike neon

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