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. :-· .· -..._. ~{·-;::~< ·""" :·reaction of which :ver~·often is highly specific. Sulphur atoms have, .. , ; · ..··· . .... ·. -. ;., · . I '• . .... ': ·.'~ ·' sulfides, such as HgS, CdS, FeS, etc., (22). An exceedingly clean and elegant . ..,· · electrolytic vapour source has recently been developed (28). From it precisely measured amounts of sulphur can be released from a Rickert-type cell. Atoms and s can be prepared by p9otolytic decomposition of sulphur· 2 containing compounds suci: as cs2 and COS (29). The resulting sulphur ·radicals are initially partially produced in excited electronic states, the . . · as a matter of fac_t,,. l;>.een :used to pioneel' the chemistry of such excited /. . . ...•·. . ·.. . .for vapours of various compbsiticin._S.:.are Knudsen cells, containing S"', S · ... :~:::;:~:],{for unsaturated vapour with higher 86, .;s3 and .especially 82 concentrations. :.-~--· .. , l-·. properties belong (30). Like 02 , .. ,·..,.._"' . .. :. :·/~.:r~·:~.· ."-:/: . . ... ~···-:·: ~ · npt-yet analyzed. .-·.- . ~· __."'; For s6and s8 only IR analysis has been reported (32). ·. " :.-.·.·., .·;.·. ·r:,.,:: ,!)•. ; ' -::.~: know.-n .~,P~ctroscopic .-~. ...·' ..'•'· ,.._ ... .:.~- :~.;.-· .-· .· -· ..· :,·_·· ' .. -8- of these components'·.,is distinc.tively specific. The future undoubtedly 'holds.· ...,,•.. .. ., r- ·~{;~":f:'_>; .'f .• • . • many exc:¥.#J:p.g disg1/ve.fi..es on the $;vnthetic applications of these .molecules: .•.f,. · . ; '· :'. ;-~~--~~ .,. -5t;.,:~:.~:- ·I ~:;-~/~? - ..._. ··· ··; ..·:.. .:~--~· which can·.be.'made continuously and.:iil very high yields. The usual sources . . . ~~- ~ ..~p ..,.:':(~;:;·zr s~, to give s8, s6 or s7 nisp~ctively in high yield, and double furnaces . Unsaturated vapours can also be produ.c~(l by the thermal decomposition of · · radicals. .thiS book. ·.wF;(·i.'J';- Proper.t~~'.~/,::9.1·the sulphur atom are described in Chapter I of ..<~t~X>•. . . • !';'(!.· and so weak that they have not yet been observed. The relative position ... ., . to s2 ·They form part of three systems,transitions between which are "forbidden" The best .:s2 has twelve elec.tron.'s for which 18 electronic states. have been observed.· .~ .'. . of these states correspond to those cif 02' but all states are closer together and the transitions occu~ at lmter energies~ The Schum~~-Range ba~ds, for ·example, whic.h cause th~ atmospheric bxygen ab,sorption .o:f:sunlight in the 1ttltraviolet, appears il:'_l ,8 in the visible and causes the deep blue color of hot. sulphur. vapour~·· ... 2 .;- : : : . The': spectrum of s4 ha.s been twice (31) observed, but . ~ ····_'l' . ..... .. ... i!:··- I'· :•. ... .. :.··c :/'::.,:\··;:. ·, :··· ... •... :- . <; - .~. . '. . -; :·~. ; .,. ' · ... ~ ~· .PDF Image | ELEMENTAL SULPHUR
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