Download Analytical Pyrolysis. Techniques and Applications by Kent J. Voorhees PDF

By Kent J. Voorhees

ISBN-10: 0408014172

ISBN-13: 9780408014175

1984 (this quantity is the results of lectures awarded on the 5th foreign Symposium on Analytical Pyrolysis, held at Vail, Colorado), hardcover version, Butterworths, London, U.K. Hardcover identify, 486 pages

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Bordoli, R. ; Sedgwick, R. ; Tyler, A. , J. Chem. Soc. Chem. Comm. 1981, 325-27. Honig, R. ; Woolston, J. , Appi. Phys. Letters 1963, 2_, 138. Conzemius, R. ; Capellen, J. , Int. J. Mass Spectrom. Ion Phys. 1980, _34-, 197-271. , Israel J. Chem. 1978, 17, 181-84. 40 9. 10. 11· 12. 13. 14. 15. 16. 17. 18. 19. ; Natusch, D. F. , Anal. Chem. 1982, J54, 26Α. Hercules, D. ; Day, R. ; Dang, T. ; Li, C. , Anal. Chem. 1982, 54, 280A. , Med. Prog. Technol. 1979, £, 109-21. , unpublished studies, University of Pittsburgh, 1982.

16. Negative LMS of o-Dinitrobenzene The formation of (M+15)~ most likely results from a nucleophilic substitution reaction on the aromatic ring, induced by the laser. The net process is substitution of an oxygen atom and an elimination of hydrogen; the peak can be written as (MfO-H)". It 28 is not immediately obvious what chemical reaction is responsible for the (MH-15)" peak· Several possibili­ ties are shown below· These correspond to substitu­ tion by 0""·, 02~ # and NO2": ArH + 0 — > Ar(T + H· ArH + O2"· — > ArH + N0 2 ~ (3) ArO" + OH· (4) > ArO" + HNO (5) Nevertheless, it is quite interesting that this kind of chemistry can occur with high probability in the laser plasma· The intensity of the (MH)-H)" peak is negligible in the case of m- and p-dinitrobenzene· Obviously some interaction between the two nitro groups of the ortho compound and the other isomers is necessary for the formation of the (M+15)~ peak.

Desorption i s generally aided by d i s s o l v i n g the sample i n g l y cerol. Although i t s r o l e i s not c l e a r , the glycerol apparently forms a very active and mobile medium which quickly returns the surface to e q u i l i b r i u m f o l l o w i n g a rather catastrophic desorption event, by carrying o f f excess charges, d i s s i p a t i n g energy, supplying new sample ions (or n e u t r a l s ) , re-dispersing these charged species, and providing a source of proton donors and a l k a l i cations.

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