Simple ultraviolet calibration source with reference spectra and its use with the Galileo orbiter ultraviolet spectrometer

• DOI: 10.1364/ao.27.000890
• Publication Date: 2009-03-18T15:25:47Z
• Authors: J. M. Ajello; D. E. Shemansky; B. Franklin; J. Watkins; S. Srivastava; G. K. James; W. T. Simms; C. W. Hord; W. Pryor; W. McClintock; V. Argabright; D. Hall
• Keywords: Orbiter; Ultraviolet; Galileo (satellite navigation); Far ultraviolet

We have developed a simple compact electron impact laboratory source of UV radiation whose relative intensity as function wavelength has an accuracy traceable to the fundamental physical constants (transitions probabilities and excitation cross sections) for atomic or molecular system. Using this source, calibrated optically thin vacuum ultraviolet (VUV) spectra been obtained synthetic spectral models important band systems H2 N2 n1P0 Rydberg series He. The model spectrum from represents extension branching ratio technique include line intensities more than one electronic upper state. fit VUV is sufficient predict serve primary calibration standard instrumentation in 80–230-nm range. applicable with full width at half-maximum ≥0.4 nm. present 10% far (120–230 nm), extreme (EUV) (90–120 20% EUV (80–90 nm). He modeled can be considered (52.2–58.4 A Ar 0.5-nm resolution 200-eV energy 35% without benefit over range 50–95 expands ultimate using four gases, He, Ar, H2, N2, 50–230 Galileo orbiter spectrometer upcoming Jupiter mission demonstrated compared results other methods.