270M
Rapid
Scanning Imaging Spectrograph
controller or software so that the backlash is always taken in the direction
of
increasing wavelength. Replace the monochromator's cover. If photoelectric detection
is available, scan slowly from 540 to 548 nm
to
ascertain that the peak is detected
within
0.1
nm
of
546.1.
12.2.2 Grating Vertical Adjustment:
Set the monochromator to
546.1
nm. Set the entrance slit height
to
1 mm. Observe
the image at the exit slit. If it is not vertically centered, center it with the vertical
adjusting screw on the grating mount.
12.2.3 Rocking the Grating:
If the grating grooves are not parallel to the slits, the diffraction plane will be tilted, and
lines imaged at the exit will appear at different heights as a function
of
wavelength. To
correct this, the vertical adjustment must have been already done. Set the
monochromator to 0.0 and check whether the exit slit image is vertically centered. If it
is not, the grating must be rocked. While sitting at O nm, repeat the vertical adjustment
as above, then return to
546.1
nm. Use the rocking adjustment screws
to
re-center the
image. If more than 1
/8
turn of either screw is required, adjust the other in the
opposite direction
to
balance the adjustment between them. Set the monochromator
to
O nm and check the centering; If it is not centered, repeat the vertical adjustment.
When the grating is properly aligned, the image will be vertically centered at both O
and
546.1
nm.
44
Reviaed
November 24,
1992
Leica Microsystems, Inc.'s Ex. 1033
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