Jahn-Teller effect in diamond-like carbon

Vesaghi, M. A.; Shafiekhani, Azizollah

doi:10.1088/0022-3727/32/21/101

Cited by 5 publications

(7 citation statements)

References 27 publications

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“…The mechanism of laser desorption/ionization is facilitated by unique nanostructures and a large number of vacancies present in DLC films . These vacancies are generated by the influence of ions reaching the growing layer with enough energy, sputtering off weakly associated entities or damaging these layers.…”

Section: Resultsmentioning

confidence: 99%

Nanostructured Diamond-Like Carbon on Digital Versatile Disc as a Matrix-Free Target for Laser Desorption/Ionization Mass Spectrometry

et al. 2008

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A nanostructured diamond-like carbon (DLC) coated digital versatile disk (DVD) target is presented as a matrix-free sample support for application in laser desorption/ionization mass spectrometry (LDI-MS). A large number of vacancies, defects, relative sp(2) carbon content, and nanogrooves of DLC films support the LDI phenomenon. The observed absorptivity of DLC is in the range of 305-330 nm (nitrogen laser, 337 nm). The universal applicability is demonstrated through different analytes like amino acids, carbohydrates, lipids, peptides, and other metabolites. Carbohydrates and amino acids are analyzed as sodium and potassium adducts. Peptides are detectable in their protonated forms, which avoid the extra need of additives for ionization. A bovine serum albumin (BSA) digest is analyzed to demonstrate the performance for peptide mixtures, coupled with the material-enhanced laser desorption/ionization (MELDI) approach. The detection limit of the described matrix-free target is investigated to be 10 fmol/microL for [Glu(1)]-fibrinopeptide B (m/z 1570.6) and 1 fmol/microL for L-sorbose (Na(+) adduct). The device does not require any chemical functionalization in contrast to other matrix-free systems. The inertness of DLC provides longer lifetimes without any deterioration in the detection sensitivity. Broad applicability allows high performance analysis in metabolomics and peptidomics. Furthermore the DLC coated DVD (1.4 GB) sample support is used as a storage device for measured and processed data together with sampling on a single device.

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Section: Resultsmentioning

confidence: 99%

Nanostructured Diamond-Like Carbon on Digital Versatile Disc as a Matrix-Free Target for Laser Desorption/Ionization Mass Spectrometry

et al. 2008

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“…The complete spectra at room temperature is shown in Fig. (1). The strong exiton line in the room temperature spectra of this crystal is also the evidence of its high quality [4].…”

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confidence: 61%

“…The amplitude of each lines varies significantly with temperature. The deconvolution results are given in table (1). Fig.…”

mentioning

confidence: 99%

“…The line is drawn to guide the eye. [4] The vacancies and their related properties in diamond and Diamond-Like Carbon (DLC) both in theoretical aspect [1] and experimental results [2] are fascinating subjects. DLC produced by different techniques, artificial diamond produced by high pressure and high temperature show peculiar Photoluminescence (PL) [3,4], Cathodeluminescence (CL) [5] and absorption [2].…”

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confidence: 99%

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Composition Lines of the Visible Band of Synthetic Diamond

Vesaghi¹,

Shafiekhani

Horiuchi

2003

Jpn. J. Appl. Phys.

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The visible band (band A) of Photoluminescence spectra of high-purity synthesized diamond is analyzed by deconvolution technique. A set of eight lines with distinct peak energy are found. The peak energy and the width of these lines were either constant or varies very slightly with temperature. The amplitude of the lines are significantly temperature. The closeness of the temperature that the amplitudes of these lines reach their minimum and the temperature which the Free-exiton emission is maximum at, is an indication of the competition between these too effects. *

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“…For high excitations, namely, the Born-Oppenheimer approximation usually breaks down due to the coupling of the electronic and vibrational motion. In the literature, this coupling is known also as JahnTeller coupling and gives rise often to the (JahnTeller) effect, that a polyatomic system with a degenerate electronic ground state is unstable and leads to a spontaneous symmetry break and term splitting [52,53]. Here, an efficient treatment of the symmetry may help in analyzing these coupling more consistently also for complex species, such as the ionic states of C 60 [54].…”

Section: Symmetry Reduction Of Matrix Elementsmentioning

confidence: 99%

Application of point‐group symmetries in chemistry and physics: A computer‐algebraic approach

Fritzsche

2005

Int J of Quantum Chemistry

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ABSTRACT:The present application of computer algebra is reviewed for its use in physical and quantum chemistry. After the rapid development of a great deal of numerical algorithms and codes during the past five decades, it is time that symbolic techniques become available in the chemical sciences. A careful implementation of such symbolic methods will make many tasks more efficient and will facilitate the investigation of many quantum systems. Following a brief account of the advantages and specific requests of applying computer algebra in chemistry and physics, emphasis is placed in this contribution on the Bethe program, a recently developed tool for using point-group symmetries in various fields of chemistry, including molecular spectroscopy, ligand-field theory, and material science, or even for the construction of molecular wave functions. Besides the great promise of symbolic techniques for modern research, their merits for education are pointed out, as computer algebra systems are likely to replace the traditional program languages in the undergraduate programs of chemistry and physics.

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Jahn-Teller effect in diamond-like carbon

Cited by 5 publications

References 27 publications

Nanostructured Diamond-Like Carbon on Digital Versatile Disc as a Matrix-Free Target for Laser Desorption/Ionization Mass Spectrometry

Nanostructured Diamond-Like Carbon on Digital Versatile Disc as a Matrix-Free Target for Laser Desorption/Ionization Mass Spectrometry

Composition Lines of the Visible Band of Synthetic Diamond

Application of point‐group symmetries in chemistry and physics: A computer‐algebraic approach

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