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Titolo:
X-ray double phase retarders to compensate for off-axis aberration
Autore:
Okitsu, K; Ueji, Y; Sato, K; Amemiya, Y;
Indirizzi:
Univ Tokyo, Engn Res Inst, Bunkyo Ku, Tokyo 1138656, Japan Univ Tokyo Tokyo Japan 1138656 Res Inst, Bunkyo Ku, Tokyo 1138656, Japan Univ Tokyo, Dept Appl Phys, Bunkyo Ku, Tokyo 1138656, Japan Univ Tokyo Tokyo Japan 1138656 ppl Phys, Bunkyo Ku, Tokyo 1138656, Japan Univ Tokyo, Dept Adv Mat Sci, Bunkyo Ku, Tokyo 1138656, Japan Univ Tokyo Tokyo Japan 1138656 Mat Sci, Bunkyo Ku, Tokyo 1138656, Japan
Titolo Testata:
JOURNAL OF SYNCHROTRON RADIATION
, volume: 8, anno: 2001,
parte:, 1
pagine: 33 - 37
SICI:
0909-0495(200101)8:<33:XDPRTC>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
CIRCULAR-DICHROISM; PLATE; DIFFRACTION; GENERATION; REGION;
Keywords:
X-ray diffraction; X-ray phase retarders; X-ray phase plates; polarized X-rays; X-ray polarization; dynamical diffraction theory; diamond;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
17
Recensione:
Indirizzi per estratti:
Indirizzo: Okitsu, K Univ Tokyo, Engn Res Inst, Bunkyo Ku, Tokyo 1138656, Japan Univ Tokyo Tokyo Japan 1138656 Bunkyo Ku, Tokyo 1138656, Japan
Citazione:
K. Okitsu et al., "X-ray double phase retarders to compensate for off-axis aberration", J SYNCHROTR, 8, 2001, pp. 33-37

Abstract

An X-ray double phase retarder system composed of two transmission-type phase retarders is proposed and developed in order to compensate for off-axisaberration (phase-shift inhomogeneity due to angular divergence of incident X-rays). The scattering planes of the two phase retarders are set to be inclined by 45 degrees with respect to the plane of incident polarization, but the two phase retarders give Bragg reflections in opposite directions. By using this X-ray optical system, vertically polarized X-rays with a 0.99 degree of linear polarization were obtained from horizontally polarized synchrotron radiation with a horizontal beam divergence of 20 arcsec (0.1 mrad). This value is favorably compared with the value of 0.87 which was obtained using a conventional single phase retarder of identical total thickness,627 mum. The comparison was made at the nickel K-absorption edge (8333 eV)with the condition that 47% of incident X-rays were transmitted through the two phase retarder crystals. The crystals were (100)-oriented diamond plates giving asymmetric 111 Laue reflections.

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Documento generato il 05/04/20 alle ore 03:58:51