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Historical Development Some Uses and Definitions
Origins of Atomic Spectra
Gratings and Grating Instruments
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aberrations absorption analytical angle of incidence Angstrom aperture aperture stop astigmatism atom axis bandwidth Chem collimator lens coma concave grating constant curvature Czerny-Turner detectivity detector developed diagram diffraction diffraction grating Ebert echelle grating electron elements emission energy levels entrance slit equation exit field stop exit slit flame focal curve focal length focus glass grating mountings grating normal grooves hydrogen illuminated illustrated in Fig increases intensity interferometer light source linear dispersion measured metal minimum deviation monochromator noise obtained optical output plane grating produced quantum number quartz radiant power radiation ratio rays reflection refractive index region resolution resolving power rotation Rowland circle ruled sample second collimator sensitivity slit image slit width sodium Solid angle spark spec spectral lines spectrograph spectrometer spectroscopic instruments spectrum spherical standard Stark effect stray light subtense tables technique temperature tion ultraviolet values vector vertex Wadsworth wavelength range wavenumber Zeeman effect