Abstract
By means of a surface ionization indicator for traces of materials in the atmosphere it has been established that many natural materials containing terpenes and their derivatives are ionized on the surface of heated molybdenum oxide at atmospheric air pressure. A mass-spectrometer method has been used to explain the mechanism of ionization of individual terpene hydrocarbons and to establish its principles. The ionization of α-pinene, alloocimene, camphene, and also adamantane on oxidized tungsten under vacuum conditions has been investigated. The α-pinene and alloocimene are ionized by surface ionization but camphene and adamantane are not ionized under vacuum conditions. The surface ionization mass spectra of α-pinene and alloocimene are of low line brightness in comparison with electron ionization mass spectra and differ between themselves. The temperature relations for currents of the same compositions of ions during ionization of a-pinene and alloocimene are also different, which leads to the possibility of surface ionization analysis of mixtures of terpenes being ionized. The ionization coefficients of alloocimene and α-pinene on oxidized tungsten under temperatures optimum for ionization and the ionization potentials of alloocimene molecules and of radicals (M-H) of both compounds have been evaluated. The routes of monomolecular decompositions of metastable vibrationally excited ions have been followed. An explanation has been given for the difference in ionization capacities of different terpenes and the possibility of surface ionization of many hydrocarbons of a certain structure has been considered.
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Literature cited
É. Ya. Zandberg and U. Kh. Rasulev, “Surface ionization of organic compounds,” Usp. Khim., 51, No. 9, 1425–1446 (1982).
V. I. Paleev, “Ionization of compounds containing benzoyl on heated surfaces with formation of positive and negative ions,” Teor. Éksp. Khim., 14, No. 6, 747–753 (1978).
U. Schade, R. Stoll, and F. W. Röllgen, “Thermal surface ionization of some complex salts,” Org. Mass Spectrom., 16, No. 10, 441–443 (1981).
V. I. Paleev, “Surface ionization of ferrocene and bisarene π-complexes of chromium,” Teor. Éksp. Khim., 19, No. 1, 59–62 (1983).
É. Ya. Zandberg, U. Kh. Rasulev, and B. N. Shustrov, “Thermal emission of positive ions of certain organic compounds from tungsten oxides,” Dokl. Akad. Nauk SSSR, 172, No. 4, 885–888 (1967).
É. Ya. Zandberg and N. I. Ionov, Surface Ionization [in Russian], Nauka, Moscow (1969).
É. Ya. Zandberg, N. I. Ionov, V. I. Paleev, and U. Kh. Rasulev, “An indicator for amines in the atmosphere based on a halogen leak detector,” Zh. Tekh. Fiz., 54, No. 9 1855–1857 (1984).
O. K. Fomin, M. V. Tikhomirov, and N. N. Tunitskii, “Mass spectra of organic ions being formed in the atmosphere of residual gases of a mass spectrometer on heated oxidized molybdenum,” Zh. Tekh. Fiz., 34, No. 8, 1441–1443 (1964).
I. N. Bakulina, N. M. Blashenkov, G. Ya. Lavrent'ev, et al., “Nonequilibrium ionization of products from exothermal decomposition of molecules on the surfaces of heated solid bodies,” Pis'ma Zh. Tekh. Fiz., 1, No. 4, 170–173 (1975).
É. Ya. Zandberg, U. Kh. Rasulev, and M. R. Sharapudinov, “Thermal ionization of certain organic compounds containing nitrogen on tungsten and its oxides, with formation of positive ions,” Teor. Éksp. Khim., 6, No. 3, 328–338 (1970).
A. Cornu and R. Massot, First Supplement to the Compilation of Mass Spectral Data, Heyden, London (1967).
E. Stenhagen, S. Abrahamsson, and F. W. McLafferty, Atlas of Mass Spectral Data, Wiley, New York (1969).
V. I. Paleev, “Production of ion retention curves when using a combined ion source,” Prib. Tekh. Éksp., No. 1, 181–182 (1975).
É. Ya. Zandberg and U. Kh. Rasulev, “Surface ionization of aniline molecules,” Zh. Tekh. Fiz., 38, No. 10, 1798–1802 (1968).
É. Ya. Zandberg and U. Kh. Rasulev, “Thermoemission properties of oxidized tungsten,” Zh. Tekh. Fiz., 38, No. 10, 1793–1797 (1968).
A. Kholov, K. S. Tursunov, U. Kh. Rasulev, et al., “Surface ionization of isomeric molecules of diethylbutylamine,” Teor. Éksp. Khim., 20, No. 4, 434–443 (1984).
É. Ya. Zandberg and U. Kh. Rasulev, “Some general characteristics in the surface ionization mass spectra of organic compounds containing nitrogen on oxidized tungsten,” Teor. Éksp. Khim., 8, No. 5, 658–664 (1972).
É. Ya. Zandberg, U. Kh. Rasulev, and Sh. M. Khalikov, “Emitters for surface ionization detectors of organic compounds,” Zh. Tekh. Fiz., 46, No. 4, 832–838 (1976).
U. Kh. Rasulev, É. Ya. Zandberg, and G. M. Bogolyubov, “Surface ionization of certain alkyl derivatives of phosphorus and arsenic,” Zh. Obshch. Khim., 44, No. 10, 2198–2205 (1974).
É. Ya. Zandberg and U. Kh. Rasulev, “Principles for formation of ions by amines during surface ionization and reaction in adsorbed films,” Izv. Akad. Nauk SSSR, Ser. Fiz., 40, No. 8, 1561–1562 (1976).
J. C. Labrune and J. G. Theobald, “A method for determining relative ionization gauge sensitivities using cross-section measurements,” Vacuum, 33, No. 3, 183–187 (1983).
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Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 22, No. 2, pp. 180–188, March–April, 1986.
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Zandberg, É.Y., Nezdyurov, A.L., Paleev, V.I. et al. Surface ionization of terpene hydrocarbons. Theor Exp Chem 22, 168–175 (1986). https://doi.org/10.1007/BF00519188
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DOI: https://doi.org/10.1007/BF00519188