Knowledge Bank

The first public discussion of the PEPSIOS triple Fabry-Perot spectrometer took place at this conference in 1963$\mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>}$ when the instrument had barely emerged from laboratory testing. Through numerous applications in atomic physics, astronomy, and aeronomy it has been developed into a reliable, efficient, and versatile spectrometer which is readily transported to remote observatories or laboratories providing special facilities. This paper will discuss the main features and advantages of the Wisconsin PEPSIOS system as currently used for making precision measurements of laboratory and planetary absorption lines. In particular, the system as used far laboratory and planetary HD and $CH4$ measurements reported at this meeting will be illustrated.