Newport ORIEL Instruments Cornerstone 260 - Determining Resolution

MCS260
CORNERSTONE 260 MONOCHROMATORS
28
7.1 DETERMINING RESOLUTION
All monochromators featuring fixed slit holders require fixed slits to be installed at the input and
output ports. Fixed slits are ordered separately, and should be the same size at the input and
output ports. Micrometers adjustable slits allow for continuous variation of the width and height.
Use the table below for guidance on resolution vs. slit width. For slit widths not specified in the
table, multiply the micrometer adjustable slit width setting (mm) by the reciprocal dispersion
(nm/mm) to calculate the resolution for each grating.
Resolution is calculated for each grating at the grating's blaze wavelength, i.e. the wavelength with
the greatest efficiency. Actual performance is determined by the monochromator wavelength
accuracy, precision and calibration. Newport suggests having the monochromator recalibrated
annually by a qualified service technician.
Calculation of Resolution Based on Fixed Slit Selection
Fixed Slit
Slit Width
Grating 1
Grating 2
Grating 3
High Resolution Configuration
77222 10 µm* 0.03 nm 0.25 nm** 0.03 nm
77220 25 µm* 0.08 nm 0.25 nm** 0.08 nm
77219
50 µm*
0.16 nm
0.35 nm**
0.16 nm
77218 120 µm 0.38 nm 0.50 nm** 0.38 nm
77217 280 µm 0.90 nm 0.90 nm 0.90 nm
77216 600 µm 1.9 nm 1.9 nm 1.9 nm
77215 760 µm 2.4 nm 2.4 nm 2.4 nm
77214
1.24 mm
4.0 nm
4.0 nm
4.0 nm
77213
1.56 mm
5.0 nm
5.0 nm
5.0 nm
77212
3.16 mm
10 nm
10 nm
10 nm
77211 6.32 mm 20 nm 20 nm 20 nm
* For slits with widths of 50 µm or less, aberrations begin to play a role in the actual achievable
resolution. The values noted above, unless otherwise stated, are calculations based on the slit
widths and grating dispersions.
** Empirically measured resolution values shown which differ from calculations due to aberrations
present when using narrow slit widths.