270M
Rapid
Scanning
Imaging
Spectrograph
grating.
Lift
the turret
up
and out of the instrument, leaving one shim washer on the
shaft. To replace a turret, reverse the procedure, taking care
to
place the rotation stop
of the turret on the same side
of
the stop bar as the sine arm pivot. Gently engage the
spur gears. you need not turn the turret
to
a stop position. When the instrument is
powered, the turret motor will rotate the turret to the selected position. When replacing
the top shim washer and collar, leave a minimal clearance under the collar to insure
free rotation of the turret.
6.4 Entrance and Exit Slits:
Your spectrometer has motorized adjustable slits located at the entrance and exit
ports. The 220ASLN and 270ASLX slits are controlled remotely by the HandScan or
your Computer. The slit width can
be
varied
in
steps of 12.5 µm. Since the
dispersion of the 270M with 1200
g/mm
gratings is
3.1
nm/mm, opening the
slits by
0.1
mm allows
an
additional
0.31
nm of spectral bandwidth
to
pass
through the instrument. In this case, a slit setting of 0.5 mm equates to a
1.55 nm bandpass. Assuming broadband light entering the spectrometer, the
bandpass at the exit for moderate to narrow slit widths will approximate a
Gaussian distribution. The nominal bandpass is measured at half of the
peak intensity.
6.5 Spectrograph Exit Port:
The 270MCA is an adapter
to
mount and support most multichannel array detectors
that conform to the industry standard three bolt circular pattern and focal plane
position. The Spex QuikScan and Spectrum One detectors
ftt,
of
course, as
do
most
other manufacturer's spectroscopic array detectors. If your detector is not from Spex,
please refer
to
the spectrograph port interface drawing in the Mechanical Interfacing
section and compare dimensions with the detector or documentation you have with
your array system. The spectrograph port provides for translation in and out
to
locate
the array in the focal plane, and rotation
to
align the array pixels with the vertical slit
image.
26
Revilled
November
24,
1992
Leica Microsystems, Inc.'s Ex. 1033
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