分光計に適する凹面回折格子のマウンティング

II: 理論的取扱の結果検討

抄録

By the use of theoretical results of study on mounting presented previously by one of authors in which a concave grating is rotated about a suitable point to change the wavelength with fixed direction of the emerging ray, numerical calculations are performed by electronic computer to find usable mountings. It is shown that Eagle mounting gives the minimun radius of rotation. In this case, the entrance and exit slits are required to be displaced upwards and downwards over the Rowland circle plane respectively. Therefore the effect of displaced slits is studied. In a general mounting, conditions of image-forming of a long slit are investigated and it is found that if the slits are made in the form of definite hyperbolic curves, all terms up to the 3rd order in light path function can be made equal to zero except the one of wl².