title: Mariner 6 and 7 ultraviolet spectrometers.
abstract: The ultraviolet spectrometers that observed the atmosphere of Mars in July and August of 1969 consist of a planetary coronagraph and an Ebert-Fastie monochromator. The spectral range 1100-4300 A was measured using two photomultiplier tubes, one with a cesium iodide photocathode, the other with a bialkali photocathode. These tubes were operated with fixed high voltage supplies and charge sensitive amplifiers. The instruments were calibrated by comparison with a tungsten lamp, a sodium salicylate screen, and a flowing nitric oxide cell. The instruments were able to satisfactorily reject off-axis light at a distance of 6600 km and measure the emission spectrum of the upper atmosphere 170 km above the surface.
authors.forename: J B
authors.initials: JB
authors.lastname: Pearce
authors.forename: K A
authors.initials: KA
authors.lastname: Gause
authors.forename: E F
authors.initials: EF
authors.lastname: Mackey
authors.forename: K K
authors.initials: KK
authors.lastname: Kelly
authors.forename: W G
authors.initials: WG
authors.lastname: Fastie
authors.forename: C A
authors.initials: CA
authors.lastname: Barth