Chandra X-Ray Observatory (CXC)
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Last modified: 30 April 2013
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Zeroth Order

Most X-rays passing through either of the transmission gratings, HETG or LETG are dispersed along the grating arms. However, some light does pass straight through the gratings without being diffracted. These events are referred to as zeroth order events.

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Last modified: 30 April 2013
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