Bentham monochromators can be supplied with 3 different types of slits:

Fixed Slits

Slits are supplied on interchangeable carriers. Three pairs of slits are included in price of any monochromator with fixed slits. Additional pairs can be ordered separately.

Variable Slits

Continuously variable, bilateral straight slits variable between 10µm and 8mm by a direct reading micrometer screw gauge. A high resolution 1µm to 1mm slit is available as an option.

Motorised Slits

As variable but micrometer is motor driven. Can be controlled by any MAC or PMC3B controller. The TMS300 monochromator houses internal motorised slits as standard.

Slit height is 20mm in all cases. A slit height adjuster is available for variable slits.

 
 

Slit Bandwidths - listed for 300mm focal length monochromators

Grating Groove Density (l/mm) 2400 1800 1200 900 830 600 300 150
Reciprocal Dispersion (nm/mm) 1.35 1.80 2.70 3.60 3.90 5.40 10.8 21.6

 

Slit Widths
Part no.
 Bandwidth Produced (nm)
(mm)
for pair of slits
0.05
FS (0.05)
0.07
0.09
0.14
0.18
0.20
0.27
0.54
1.08
0.10
FS (0.10)
0.14
0.18
0.27
0.36
0.39
0.54
1.08
2.16
0.20
FS (0.20)
0.27
0.36
0.54
0.72
0.78
1.08
2.16
4.32
0.37
FS (0.37)
0.50
0.67
1.00
1.33
1.44
2.00
4.00
8.00
0.40
FS (0.40)
0.54
0.72
1.08
1.44
1.56
2.16
4.32
8.64
0.50
FS (0.50)
0.68
0.90
1.35
1.80
1.95
2.70
5.40
10.80
0.56
FS (0.56)
0.76
1.00
1.51
2.00
2.18
3.00
6.05
12.10
0.74
FS (0.74)
1.00
1.33
2.00
2.66
2.89
4.00
8.00
16.00
1.00
FS (1.00)
1.35
1.80
2.70
3.60
3.90
5.40
10.80
21.60
1.12
FS (1.12)
1.50
2.00
3.00
4.00
4.40
6.00
12.10
24.20
1.48
FS (1.48)
2.00
2.67
4.00
5.33
5.78
8.00
16.00
32.00
1.85
FS (1.85)
2.50
3.33
5.00
6.66
7.22
10.00
20.00
40.00
2.00
FS (2.00)
2.70
3.60
5.40
7.20
7.80
10.80
21.60
43.20
2.78
FS (2.78)
3.80
5.00
7.50
10.00
10.84
15.00
30.00
60.00
3.70
FS (3.70)
5.00
6.67
10.00
13.32
14.40
20.00
40.00
80.00
4.00
FS (4.00)
5.40
7.20
10.80
14.40
15.60
21.60
43.20
86.40
5.56
FS (5.56)
7.50
10.00
15.00
20.00
21.68
30.00
60.00
120.10
8.00
FS (8.00)
10.80
14.40
21.60
28.80
31.20
43.20
86.40
172.80

 

Grating Groove Density (l/mm)
2400
1800
1200
900
830
600
Reciprocal Dispersion (nm/mm)
1.35
1.8
2.70
3.60
3.90
5.40

 

Bandwidth (nm)
 Slit width required (mm)
0.50
0.37
0.28
0.19
1.00
0.74
0.56
0.37
2.00
1.48
1.11
0.74
0.56
0.51
5.00
3.70
2.78
1.85
1.39
1.28
10.00
7.40
5.56
3.70
2.78
2.56
1.85
20.00
5.56
5.12
3.70