STIS Instrument Handbook for Cycle 24

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0.1X0.03 Aperture

Description

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.

Special Considerations

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

λ	% Throughput
1200	19.9
1800	31.4
2400	36.0
3000	36.3
3600	34.8
4200	32.8
4800	30.9
5400	28.9
6000	27.0

Aperture	Projected Length (arcsec)	Width (arcsec)
0.1X0.03	0.1	0.025

Figure 13.75: 0.1X0.03 Aperture Throughput as a Function of Wavelength