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GRATING SPECTR0METER OF THE EBERT VARIETY
PARAB0LIC OPTICS VS SPHERICAL 0PTICS IN
0ne now wishes 0PTICS adjacent channels aligned angles of incidence astigmatism axis center of curvature channel width chart recorder chopper housing chopper wheel mount circular slits coding pattern coincident coma corresponding channels desired radiation Details of grating diffraction angle end plates entrance and exit entrance disk entrance half entrance slit exit aperture exit channel exit disk exit half exit slits f-number Figure grating equation grating is rotated grating normal G green line half-period Illustration of Moire Line a a Littrow mode Mask present micrometer Modified Ebert spectrometer Moire fringes multislit number of slots opaque slot optical Output due paraboloid perpendicular photomultiplier plane formed radiation at wavelength radiation passing resolving power revolution frequency screws Shadowgraph shaft shown in Fig side lobes signal sodium D-lines spectrometer housing spectromodulator Spectrophotometry spherical mirror spikes teflon tion transparent slots unsuccessful chopper wheel view of chopper wave analyzer wavelength AQ wavelength error