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Historical Development Some Uses and Deﬁnitions
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A/mm aberrations absorption angle of incidence aperture aperture stop astigmatism atom axis bandwidth beam Chem collimator lens coma concave grating concave mirror constant curvature Czerny—Turner deﬁned deﬁnition detectivity detector diffraction distance Ebert echelle grating eﬂiciency electron elements energy levels entrance slit equation exit slit f-number ﬁlm ﬁlter ﬁrst ﬁxed ﬂame ﬂuctuations ﬂux focal curve focal length focus ghosts grating mountings grating normal grooves illuminated illustrated in Fig increases intensity lenses light source limit linear dispersion measured minimum deviation monochromator noise obtained off-axis optical output photographic phototubes plane grating prism quantum number quartz radiant power radiation ratio rays reﬂection refractive index resolution resolving power rotation Rowland circle shot noise slit image slit width solid angle speciﬁc spectral lines spectral range spectrograph spectrometer spectroscopic instruments spectroscopic lines spectrum spherical stray light temperature tion values vector Wadsworth wavelength range