✦ LIBER ✦

A comparison of theoretical Oiiiline strengths with XUV solar observations from the S082A instrument on boardSkylab

✍ Scribed by F. P. Keenan; S. M. McCann; K. M. Aggarwal; K. G. Widing

Publisher: Springer
Year: 1989
Tongue: English
Weight: 288 KB
Volume: 122
Category: Article
ISSN: 0038-0938
DOI: 10.1007/bf00162825

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✦ Synopsis

Relative level populations in OIII, determined using R-matrix calculations of electron impact excitation rates, are used to derive the theoretical emission line ratios R 1 = 1(525.80 ~)/I(599.62 A), R 2 = I(507.41 h)/I(599.62 A), R3 = 1(507.71 A)/I(599.62/~), and R4 = 1(508.18 A)/I(599.62 it). Electron temperatures deduced from the observed values of these ratios for several solar features obtained with the NRL S082A slitless spectrograph on board Skylab are in good agreement, and also compare favourably with that of maximum O m fractional abundance in ionisation equilibrium, log Tma x = 4.96. These results provide experimental support for the accuracy of the atomic data adopted in the line ratio calculations.

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Oxygen interaction of CdS-based gas sens

Oxygen interaction of CdS-based gas sensors with different stoichiometric compositions was studied by X-ray photoelectron spectroscopy (XPS) and thermal-desorption mass spectroscopy observations combined with conductivity measurements. Three different types of film with different atomic ratios of Cd/S were used in the study of oxygen chemisorption in a low-temperature range between 300 and 570 K. Spray pyrolysis was used for the deposition of the films on glass substrates; XPS and energy dispersive spectroscopy of X-ray together with atomic force microscopy and scanning electron microscopy were used for the characterization of the composition and structure of the films. It was possible to distinguish different temperature ranges for the thermal desorption of the different adsorbed oxygen species. A comparison of the data from XPS and mass-spectroscopy observations with conductance measurements allows to conclude that metallic surface atoms are responsible for different interactions of oxygen species with CdS surfaces.

📂 Article 📅 1995 🏛 Elsevier Science 🌐 English ⚖ 379 KB