Photoionization and mass-selected photodissociation of tellurium clusters

Willey, K. F.; Cheng, Po‐Yuan; Taylor, T. G.; Bishop, M. B.; Duncan, M. A.

doi:10.1021/j100367a061

Cited by 46 publications

(18 citation statements)

References 2 publications

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“…[21][22][23][24][25] For Ar n + , 5 (CO 2 ) n + , 16 and (CO 2 ) n -, 17 on the other hand, the average number of ejected atoms or molecules is proportional to the photon energy. The photofragmentation of these ions proceeds via the ejection of neutral monomers rather than a neutral cluster.…”

Section: Resultsmentioning

confidence: 99%

Electronic Structures and Photoevaporation Dynamics of Benzene Cluster Ions

1997

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The electronic spectra of benzene cluster ions, (C 6 H 6 ) n + with n ) 3-6, are measured through mass-selected photodissociation spectroscopy. The spectra in the 400-1100-nm region show three distinct absorption maxima centered around 430, 590-620, and 950 nm, which are analogous to the spectrum of (C 6 H 6 ) 2 + . The 950-nm band is assigned to a charge resonance (CR) band characteristic of the dimer ion, while the other two bands are attributed to local excitation bands. The position of the CR band is found to be almost independent of cluster size. The result suggests that the cluster ions have a charge-localized structure involving a strongly bound dimer ion core. In addition, the number and translational energy of neutral molecules ejected following photoexcitation are measured for (C 6 H 6 ) n + with n ) 3-8 in the photon energy range of 0.5-3.0 eV. The average number of ejected molecules increases linearly with increasing photon energy, suggesting that the fragmentation proceeds via the sequential ejection of neutral monomers. The average translational energy carried by one monomer is determined to be 50-70 meV, which is comparable with the calculated value according to a statistical theory. A large part of the imparted photon energy is partitioned into internal energies of the products. These results indicate that the photofragmentation of (C 6 H 6 ) n + can be regarded as a unimolecular decay of vibrationally hot clusters, despite the promotion of the chromophoric dimer core to the repulsive excited state.

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Section: Resultsmentioning

confidence: 99%

Electronic Structures and Photoevaporation Dynamics of Benzene Cluster Ions

1997

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“…Te clusters with up to 85 atoms have been identified, [41][42][43][44][45][46] and structures and vibrations of clusters up to Te 12 have been calculated. [47][48][49][50][51][52] Extended x-ray-absorption fine-structure (EXAFS) measurements show that the interchain bonds in very thin (0.5 nm) Te films are shorter (2.792Å) than in thicker (300 nm) films (2.837Å) or in trigonal Te.…”

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confidence: 99%

Structure and dynamics in amorphous tellurium and Tenclusters: A density functional study

Akola

Jones

2012

Phys. Rev. B

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Density functional/molecular dynamics simulations have been performed on amorphous tellurium (a meltquenched sample of 343 atoms at 300 K) and on Te clusters with up to 16 atoms. The former extend our calculations on liquid Te at 560, 625, 722, and 970 K [Phys. Rev. B 81, 094202 (2010)]. We discuss trends in structures (including those of other group-16 elements), electronic densities of states, and vibration frequencies. Chain structures are common in S and Se, but the chains in amorphous Te are short, and branching sites with threefold-coordinated atoms are common. The energy difference between two-and threefold local coordination depends sensitively on the exchange-correlation functional used. Cavities are characteristic of amorphous Te (37% of total volume), but are absent in crystalline (trigonal) Te.

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“…At the same time, the results of other works differ substantially, especially for Te 2+ . It is possible that, in our work and work [46], the DI process of some tellurium molecule affected the formation energy of a doubly charged atomic tellurium ion, which led to overestimated ionization energies. Thus, by analyzing the data in Table 6, we may conclude that the most comprehensive information about tellurium ions is contained in our work.…”

Section: Telluriummentioning

confidence: 73%

“…The intensity ratio between the positive diatomic molecular and atomic tellurium ions, Te + 2 /Te + , corresponding to the electron impact ionization decreased in comparison with the sulfur and selenium cases. For negative tellurium ions created by the photon ionization, the analogous ratio, Te − 2 /Te − , has different values [40,[44][45][46].…”

Section: Telluriummentioning

confidence: 99%

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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Photoionization and mass-selected photodissociation of tellurium clusters

Cited by 46 publications

References 2 publications

Electronic Structures and Photoevaporation Dynamics of Benzene Cluster Ions

Electronic Structures and Photoevaporation Dynamics of Benzene Cluster Ions

Structure and dynamics in amorphous tellurium and Tenclusters: A density functional study

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

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