Grating ruled width

Spectrometer ARL 3400 C Quantovac 1 m Paschen-Range monuing grating ruled 1080 lines mm"1, 0.309 nm mm-1 reciprocal linear dispersion (3rd order). Primary slit width 20 pm, secondary slit 50 pm, Hamamatsu R-306 photomultiplier tube... 

Grating spectroscopy makes use of the strong wavelength dependence (or dispersion) in the positions of the diffraction peaks. The width of the diffraction peak will give the resolution for a grating with N rulings, the closest minimum occurs at angle AO from a diffraction maximum. 

This hydrogen band at 3 = 0.2 was also studied with a diffraction grating spectrometer, and its optical density was found to be 0.1 and its half-width to be 21 cm.- (Fig. 10). Condon (134) showed that infrared spectra were expected to be induced by high electric ffelds and that the selection rules... 

Figure 3.1-6 The main components of a grating spectrometer N is the number of interfering rays, given by the number of rules so is the half width of the diffraction pattern of the collimator lens with the diameter D and the focal length /, it determines the optimal slit width (Laqua, 1980), h is the slit length.

U Use Equation 7-13 for the resolving power of a grating monochromator to estimate the theoretical minimum size of a diffraction grating that would provide a profile of an atomic absorption line at 500 nm having a line width of 0.002 nm. Assume that the grating is to be used in the first order and that it has been ruled at 2400 grooves/mm. 

Figure 3.4 Echelle grating (a angle of incidence, (3 angle of diffraction, 0 blaze angle, 2<5 angle between incident and diffracted ray at blaze maximum, W ruled grating width)...

As a general rule, there is more to gain from the use of programmed scan in prism instruments than in grating instruments. The reason for this is the larger variation in resolution inherent in prism instruments. In grating instruments with linear frequency abscissa presentation, the variation in spectral slit width in frequency units is generally no more than 2 1. 

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