This volume C 1 is the first supplement volume to "Phosphor" C which was published in 1965 and covers the compounds of phosphorus. Starting with the binary species formed between phosphorus and hydrogen, the present volume deals with the neutral mononuclear compounds PH through PH; the ions featuring the same stoichiometric composition are s covered in separate sections. PH and PH are the major initial gaseous decomposition products of PH and, thus, also 2 J intermediates in many of its gas-phase reactions. Both molecules and their ions have been thoroughly investigated by a variety of modern, high-resolution spectroscopic methods during the last three decades. The coverage of their physical, and mostly molecular, properties re presents the largest part of the first two chapters (PH and ions pp. 2 to 47; PH and ions pp. 47 2 to 111). PH is the only compound described in this volume which is thermally stable under normal J conditions. It is the phosphorus analog of ammonia, but exhibits, however, a quite different chemical behavior towards most elements and compounds. The majority of its physical, and in particular spectroscopic, properties have been determined in great detail since the sixties, partially in regard to spectroscopic investigations of the atmospheres of the outer planets."

The present voLume describes the chemicaL behavior of eLementaL tungsten toward the non- metaLlic eLements nitrogen to arsenic (i.e., N, F, CL, Sr, I, S, Se, Te, Po, S, C, Si, P, and As). The description of the chemicaL behavior starts with information on the phase diagrams wh ich aLLow an overview of the existing stabLe compounds. The major part of the information in this voLume is about the kinds of products, the experimentaL conditions, as weLL as the kinetics and thermodynamics of their formation. Short descriptions of buLk diffusion in binary systems compLement the kinetic data on the mostLy diffusion-controLLed reactions. Pure surface phenomena on tungsten are not considered. A Large chapter is devoted to the comprehensiveLy studied chemicaL processes and trans- port processes in tungsten-haLogen Lamps. Product formation in the tungsten-carbon and tungsten-silicon systems is aLso of speciaL interest in view of possibLe appLications. The present voLume concLudes the series of voLumes devoted to the chemicaL behavior of eLementaL tungsten. Interactions and reactions with nobLe gases, hydrogen, and oxygen are covered in "Wolfram" Erg.-Sd. S 1. Interactions and reactions with metaLlic eLements are described in "Tungsten" SuppL. VoL. A 6a (eLements antimony to barium) and in "Tungsten" SuppL. VoL. A 6 b (eLements zinc to actinides).