MCS260B
CORNERSTONE 260B MONOCHROMATORS
18
5 INPUT AND OUTPUT SLITS
To operate any monochromator, slits are required at the input and output port. The slit assemblies offered
with the Cornerstone 260B all have 1.5-inch male flanges, allowing them to be easily connected to the wide
variety of Oriel accessories and instruments.
Note: The slits need to be the same width and height at the input and output ports. A wider input slit when
compared to the output slit results in more stray light inside the instrument. A wider output slit with respect
to the input slit will not increase throughput.
5.1 FIXED SLITS
The fixed slits slide into the 77294B holders at the input and output ports (Fig. 8). The width and
height cannot be adjusted but may be individually replaced with other slit sizes. Fixed slits are a low-
cost alternative to micrometer adjustable or motorized slits and provide excellent repeatability. They
are a good choice when only a few slit sizes are required.
Fixed slits are sold separately to allow customized choices based on the needs of the application
(Fig. 9). When ordering, be sure to purchase two fixed slits of the same model for single output port
instruments
– one for the input port, and the other for the output port. For dual output port
instruments , be sure to purchase three fixed slits of the same model
– one for the input port, and
the others for the output ports. Insert the slit as shown, with the label facing outward. Be sure that
it is fully inserted into the holder’s slot to ensure the best performance and repeatability.
Figure 8: A Fixed Slit Installed into the Holder.
Fixed Slit Model
Width
Height
77222
10 µm
2 mm
77221
50 µm
3 mm
77220
25 µm
3 mm
77219
50 µm
6 mm
77218
120 µm
18 mm*
77217
280 µm
18 mm*
77216
600 µm
18 mm*
77215
760 µm
18 mm*
77214
1.24 mm
18 mm*
77213
1.56 mm
18 mm*
77212
3.16 mm
18 mm*
*Actual slit height is 18 mm, usable height is 12 mm.
Figure 9: Available Fixed Slits.
