|STIS Instrument Handbook for Cycle 25|
This slit provides the highest spectral resolution of any STIS slit and is restricted to use with the MAMA echelle gratings. Tests during ground calibration with this slit to obtain MAMA exposures of a mono-isotopic platinum lamp source produced resolving powers in excess of 200,000.Observations with this slit require a prior PEAKUP. The peakup is performed in two stages - first with the 0.2X0.09 aperture (or one of the small neutral density apertures), and then with the 0.1X0.03 aperture.
Table 13.28: 0.1X0.03 Throughputs
Figure 13.75: 0.1X0.03 Aperture Throughput as a Function of Wavelength