New methods of X-ray diffraction spectrometry. II. Principle and performance of a novel type of curved-crystal spectrometer

Sørum, H.; Bremer, Jon

doi:10.1107/s0021889880012290

Cited by 7 publications

(1 citation statement)

References 5 publications

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“…There exist, however, some cases where improvements in resolution and intensity have revealed new features, as demonstrated by some new spectrometer types (Schnopper & Kalata, 1969;Das Gupta & Gott, 1970;Sauder, Huddle, Wilson & LaVilla, 1977). As a new approach we have in this and the following paper (Sorum & Bremer, 1980; hereafter referred to as II) investigated the possibility of obtaining high resolution and intensity by means of perfect cylindrically bent crystals. Both the one-and the two-crystal cases will be considered.…”

Section: Introductionmentioning

confidence: 99%

New methods of X-ray diffraction spectrometry. I. Image formation in curved crystals

Bremer¹,

Sørum²

1980

J Appl Cryst

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Image formation in a dispersive system, consisting essentially of a perfect cylindrically bent crystal in association with a point source, has been studied both for transmission and reflection. The Laue and Bragg conditions have been calculated together with the dispersive power. The treatment has been extended to include two crystals. In the single‐crystal case and also for most versions of two‐crystal combinations a point or line focus is required to obtain highly resolved spectra. A few versions of the two‐crystal arrangement can be made to be focusing, thereby enabling the use of an extended radiation source.

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Section: Introductionmentioning

confidence: 99%

New methods of X-ray diffraction spectrometry. I. Image formation in curved crystals

Bremer¹,

Sørum²

1980

J Appl Cryst

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The CrK Series X‐Ray Emission Spectra

Sørum

Weng

Bremer

1982

Physica Status Solidi (b)

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The electron-excited CrK series X-ray spectra are investigated by means of curved crystal spectrometry, permitting at the same time high intensity and resolution. No directly observable fine structures are found for a1,2 and pi, 3. Low-energy satellites as well as weak high-energy satellites are, however, found both for a1,2 and p1,3. A low-energy satellite may be present also for ps. The highenergy satellites for the a-doublet are most probably due to a spectator vacancy in the 31-level and/or in the valence band V, corresponding to the transitions KM -LM, KV -LV, respectively. Similarly the p1,3-structure may contain contributions from the transitions KM -+ LN and/or KV -c XV. I n addition to the structure caused by interaction between the final-state hole and the unfilled 3d-level the radiative Auger effectsK +. LV, K -c MV, and K -+ W are probably present a t the low-energy side of the lines. The FWHM value for al is (1.90 f 0.05), for a? (2.60 f 0.05), for pl,3 (2.68 & 0.05), and for p5 (4.9 0.1) eV. The spin-orbit split between the 3p3/9 and 3~112 levels is measured for the first time to be 0.74 eV for Cr, a value which is thus considerably less than the theoretical value of 1.06 eV.Die Elektronen-angeregten Rontgenspektren der CrK-Serie werden mit Hilfe eines Spektrometers mit gebogenem Knstall, das gleichzeitig hohe Intensitat und A4uf10sung erlaubt, untersucht. Es wird keine direkt registrierbare Feinstruktur fur a1,2 und p1,3 gefunden, aber Satelliten auf der kurzwelligen und auf der langwelligen Seite werden im Falle von cq,9 und p1,3 nachgewiesen. Eine langwellige Satellitenstruktur wird zudem fur p5 gefunden. Die kurzwelligen Satelliten fur das a-Dublett beruhen wahrscheinlich auf einer Spektatorvakanz im &I-Niveau und/oder im Valenzband V, dem Vbergang K3f -. LM bzw. KV -. LV entsprechend. I n gleicher Weise konnte die pl,s-Struktur Beitrage vom ubergang K N -LM und/oder KV -MV enthalten. Zusatzlich zur Struktur, die durch Wechselwirkung zwischen Endzustand und ungefulltem 3d-Niveau hervorgerufen wird, sind die strahlenden Auger-Effekte K -. LY, und K -MV und K -VV wahrscheinlich an der langwelligen Seite der Linien betedigt. Der FWHX-Wert fur al ist (1,90 & 0,05), fur a? (2,60 & f 0,05), fur $1.3 (2,68 5 0,05) und fur p5 (4,9 -i 0,l) eV. Die Spin-Bahn-Aufspaltung zivischen den 3ps;z-und 3p1:e-Siveaus mird zum ersten Ma1 zu 0,74 eV fur Cr gemessen, und ist erheblich kleiner als der theoretische Wert 1,06 eV.

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Intensity Distributions of the K Emission Spectra of Iron

Sørum

1982

Physica Status Solidi (b)

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A curved crystal spectrometry is applied for the study of the electron excited (30 kV) FeK emission spectra. No fine structure is directly seen in the α1,2 and β1,3 lines, but the lines are strongly asymmetric. The asymmetry is due to relatively strong low energy satellites, probably caused by the radiative Auger effects K → LV, K Deutsche Forschungsgemeinschaft MV, in addition to interactions between the final state hole and the unfilled 3d level for β1,3; and to unresolved splittings of the LIII and LII levels for α1 and α2. Weak high energy satellites are also present for the same lines and most likely due to a spectator vacancy in the M level and/or in the valence band V. The Kβ5 band is corrected for background, continuous radiation, self‐absorption, and overlap with β1,3. The intensity maximum of Kβ5 is (2.56 ± 0.1) eV below the Fermi energy. The FWHM value for α1 is (2.60 ± 0.05), for α2 (3.02 ± 0.05), for β1,3 (4.04 ± 0.05), and for β2,5 (5.56 ± 0.05) eV. The index of asymmetry for α1 is (1.57 ± 0.05), for α2 (1.26 ± 0.05), and for β1,3 (1.77 ± 0.05). The spin—Orbit splitting between the 3p3/2 and the 3p1/2 levels obtained from the Lorentzian fit for β1,3 is (1.22 ± 0.05) eV, whereas Hartree‐Fock calculations give 1.58 eV.

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New methods of X-ray diffraction spectrometry. II. Principle and performance of a novel type of curved-crystal spectrometer

Cited by 7 publications

References 5 publications

New methods of X-ray diffraction spectrometry. I. Image formation in curved crystals

New methods of X-ray diffraction spectrometry. I. Image formation in curved crystals

The CrK Series X‐Ray Emission Spectra

Intensity Distributions of the K Emission Spectra of Iron

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