Electron-impact ionization and dissociative ionization of sulfur in the gas phase

Zavilopulo, A. N.; Markush, P. P.; Шпеник, О. Б.; Mykyta, M. I.

doi:10.1134/s1063784214070299

Cited by 9 publications

(6 citation statements)

References 14 publications

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“…4, ). It turned out that the relative intensities of tellurium ion peaks in the examined temperature interval have an almost linear character, in contrast to the analogous dependences for selenium and sulfur [25,63], for which the deviation of the temperature coefficients from the linearity was observed for all researched ions. As was in the case of sulfur and selenium, the state of the Te 2 molecule is the stablest in the gaseous phase within a wide range of evaporation temperatures, and it is in this state that the maximum number of diatomic tellurium molecules in the vapor composition is observed [20].…”

Section: Telluriummentioning

confidence: 71%

Inelastic Processes of Electron Interaction with Chalcogens in the Gaseous Phase (a Review)

et al. 2020

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Complex research of elementary pair collision processes occurring when low-energy (0–70 eV) electrons pass through chalcogen (S, Se, Te) vapor has been carried out in the evaporation temperature intervals of those elements (T = 320÷700 K for sulfur, 420÷490 K for selenium, and 400÷600 K for tellurium). The vapor compositions of indicated elements are studied using the mass spectroscopy method. The radiation spectra are analyzed in the wavelength interval from 200 to 600 nm with the help of optical spectroscopy. Using highly monoenergetic electron beams, the total (integral) formation cross-sections for positive and negative S, Se, and Te ions are measured. It is found that, under the experimental conditions, the main components of chalcogen vapor are molecules containing 2 to 8 atoms. At the energies of bombarding electrons below 10 eV, the emission spectra mainly consist of bands of diatomic molecules, and, at higher energies (E > 15 eV), there appear separate atomic and ionic lines. At E = 50 eV, the lines of singly charged ions are the most intense ones. It is shown that the most effective reaction channel is the interaction of electrons with diatomic molecules of indicated elements, whereas other processes are mainly associated with the decay of polyatomic molecules. The excitation and ionization thresholds for interaction products are found by analyzing the energy dependences of process characteristics. Specific features are also observed in the energy dependences of the excitation and ionization functions. Doubly charged ions of diatomic sulfur molecules, as well as selenium and tellurium atoms, are revealed for the first time. The appearance of triply charged ions of diatomic sulfur molecules is also detected. The main contribution to the total (integral) effective ionization cross-section of both positive and negative ions is proved to be made by the interaction processes of electrons with diatomic molecules S2, Se2, and Te2. Besides the experimental research, a detailed theoretical study is carried out. Calculations with a theoretical analysis of their results are performed for the structural characteristics of homoatomic sulfur, Sn, selenium, Sen, and tellurium, Ten, molecules with n = 2÷8; namely, interatomic distances, ionization potentials, electron affinity energies, and dissociation energies. The energy characteristics are applied to calculate the appearance energies for singly and doubly charged ionic fragments of those molecules at the dissociative ionization. The obtained results are carefully compared with the available experimental and theoretical data.

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Section: Telluriummentioning

confidence: 71%

Inelastic Processes of Electron Interaction with Chalcogens in the Gaseous Phase (a Review)

et al. 2020

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“…40 kJ mol −1 [49,50] above that of O 2 [51,52] , are both unknown in bulk solid salts as opposed to impurity color centers, e.g., [65]. While [S 2 ] 2− is a well-established anion [13], the related dication [S 2 ] 2+ remains relatively unknown to the experimentalist except as a gas phase ion fragment [66] and from electrochemical syntheses [67,68]. While S 2 F 2 disproportionates into elemental sulfur and SF 4 was suggested to be acid-catalyzed [], [S 2 ] 2+ was not invoked.…”

Section: -Oxygen Species (Species With Three Oxygens)mentioning

confidence: 99%

Paradoxes and paradigms: on ambisaline ions of oxygen, fluorine, and related oxyfluorides

2020

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In this review, we discuss different ions of oxygen and fluorine and related oxyfluorides and isoelectronic species from the viewpoint of their potential ambisaline character, defined as a property of species X so that both X + and X − may both be found in isolable salts. The term is applied to the ions as well as to the neutral precursor. Reactivity versus stability, reported and plausible synthetic approaches of well-established and probable species are discussed from the perspective of thermochemistry.

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“…Молекули PTCDA мають помірну хімічну реактивність і утворюють на різних підкладках добре впорядковані плівки, що мають вигляд "цегляної кладки" [7]. Експерименти виконувалися на установці з монопольним мас-спектрометром МХ 7304А [9] з розділенням по масі ΔM = 1 Да. Молекулярний пучок PTCDA формувався за допомогою джерела ефузійного типу, концентрація молекул в області взаємодії з електронами була близькою до 10 10 -10 11 см -3 .…”

Section: національної академії наук україни фізикаunclassified

“…рис. 1) при β-розриві молекулярного іона [9]. З іншого боку, наявність у мас-спектрі іонів молекул СО і СО 2 слід вважати результатом фрагментації нестабільної дикарбоксильної групи С 2 О 3 [5,10].…”

Section: національної академії наук україни фізикаunclassified

Fragmentation of a PTCDA molecule by electron impact

Шпеник¹,

Pylypchynets²,

Zavilopulo³

2018

Dopov. Nac. akad. nauk Ukr.

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+ та CO + , CO 2 + і O +. Досліджено також функції повної (інтегральної) іонізації молекули PTCDA та фрагментарних іонів, а методом найменших квадратів за пороговою ділянкою кривої повного відносно го перерізу іонізації визначена енергія іонізації молекули PTCDA та енергії появи іонів фрагментів. Визначені температурні залежності формування найбільш інтенсивних іонів фрагментів в інтервалі температур 320-500 К при енергії електронів 80 eВ.

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Electron-impact ionization and dissociative ionization of sulfur in the gas phase

Cited by 9 publications

References 14 publications

Inelastic Processes of Electron Interaction with Chalcogens in the Gaseous Phase (a Review)

Inelastic Processes of Electron Interaction with Chalcogens in the Gaseous Phase (a Review)

Paradoxes and paradigms: on ambisaline ions of oxygen, fluorine, and related oxyfluorides

Fragmentation of a PTCDA molecule by electron impact

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