From 3f50f5420d63d48a885323a2226ae191a9c6576d Mon Sep 17 00:00:00 2001 From: Ray Osborn Date: Fri, 22 Dec 2023 20:54:54 -0600 Subject: [PATCH] Minor tweaks of the text --- docs/source/introduction.rst | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/docs/source/introduction.rst b/docs/source/introduction.rst index 977a2a3..23f13cd 100644 --- a/docs/source/introduction.rst +++ b/docs/source/introduction.rst @@ -46,11 +46,13 @@ single 3D data volume. *Experimental geometry used in NXRefine.* -The Φ-axis is approximately perpendicular to the beam. The Φ-axis motor -is on a χ-circle, with χ = 0° corresponding to a vertical axis of -rotation. The figure shows a configuration, in which χ = -90°. The -orientation of the Φ-axis can also be adjusted in the horizontal plane -by ω and in the vertical plane by θ. +The sample is at the center of a χ-circle, which can be rotated about +the horizontal or vertical axes by θ or ω, respectively. When θ = ω = 0, +the χ-circle is perpendicular to the incident beam. During a scan, the +sample is rotated about the Φ-axis, which is vertical when χ = θ = 0. +The figure shows a configuration, in which the Φ-axis is horizontal, +with θ = ω = 0 and χ = -90°. The dotted lines show the orientation of +the Φ-axis with ω = ±15°. .. note:: This geometry is equivalent to the four-circle geometry defined by H. You [see Fig. 1 in J. Appl. Cryst. **32**, 614