High resolution or high bandwidth monochromator

Claim 1

In a monochromator, the combination comprising a. means forming entrance, intermediate and exit slits to define successive sections of a double monochromator operable to isolate a band of wavelengths with high and low limits, and b. beam dispersing means in the beam path between the entrance and intermediate slits and between the intermediate and exit slits, and characterized by opposed directions of dispersion in the successive sections, c. said intermediate slit forming means including first and second jaws, the first jaw carried to be independently adjustable relative to the second jaw to increase and decrease the width of said band by changing only one of said limits, the entrance and exit slit forming means also including pairs of jaws, d. first control means connected with said first jaw to control said independent adjustment thereof, and e. other control means connected with said entrance, intermediate and exit slit forming means to simultaneously vary the widths of the entrance, intermediate and exit slits independently of the first control means by movement of both jaws of each slit forming means, the connection of the first control means with the first jaw characterized in that said independent adjustment thereof may be made separate from the variation in intermediate slit width effected by said other control means.